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Old May 18th, 2007, 06:32 PM   #1 (permalink)
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TECH: Exhaust System FAQs

I have been seeing a lot of cornfusion on exhaust systems lately. Here is a little primer on what is out there and some of the terminology :-)

Stock Exhaust:




GT stock piping diameter is 2.388"

GS stock piping diameter is 2.129"

The ECU does not check, care about or look at the rear cat (the big round one under the center of the car) for anything.

GS Only:

The ECU only checks the front cats (the pair side by side up on the exhaust manifold, under the heat shield) and there are ways around that with little spacers.

GT Only:

The ECU only checks the front cats (one on the front exhaust manifold, the other on the rear exhaust manifold) and there are ways around that with little spacers.



Axle Back

Axle-back exhaust systems take advantage of the reasonably sized stock piping and non restrictive resonator after the catalytic converter. If you are on a budget, if you wont be going berserk with power mods, the axle back exhaust systems are for you.

They will go from just after the rear axle and back to the rear bumper:



Looks like this installed:




A Cat Back

A Cat Back exhaust will go from just after the catalytic converter back to the rear bumper.



Since there is no flange there you will have to cut the pipe and clamp the cat back exhaust on.




Here is a pic of the Magnaflow Cat Back clamped on:





The GT Magnaflow cat back piping is 2.5"

The GS Magnaflow cat back piping is 2.25"at the first bit before the resonator to slip over the stock piping and then to 2.5" for the majority of it.


Full Exhaust

A full exhaust would be something like the Injen that bolts on to the flange just ahead of the catalytic converter.



The Injen Full Exhaust which includes a metallic core high flow cat bolted on there:




Stock exhaust Manifolds and Y Pipe


The stock exhaust manifolds of the GT look like this. The pre-cats are welded into the stock manifold. Any headers will eliminate these pre-cats.




Front Pre-cat/Manifold:





Rear Pre-cat/Manifold





Stock Y-Pipe




When installing headers with O2 sensor spacers/anti-foulers, it does not matter what sensor goes in what hole. Whatever works best with the cable routing is the only concern. However it is very important that the spacers are installed under the 2nd O2 sensors, the ones with the black wire and the grey connector.

On cars with a more restrictive exhaust system you will need a spacer with a smaller hole in it. With a more open exhaust you will need a spacer with a bigger hole to get more fumes to the sensor. We sell spacers with smaller holes. It is easy to make the holes larger, very difficult to close them up if needed. If you install a spacer and get a SES warning light… FREAK THE EFF OUT AND RUN TO THE NEAREST MESSAGEBOARD AND TELL EVERYONE “OMG HtE hEX0RZ MY SES LIG4T IS ON!!!!” .-~*~-. Not really. It is totally annoying. Chill. Just check the code and if the code says the cat is below efficiency or has low voltage, open the hole a little.

On a GS the spacers go in the down pipe piece, not the headers.





Cat Funny Business:

The ECU does not check, care about or look at the rear cat (the big round one under the center of the car) for anything.

The ECU only checks the front cats (the pair side by side up on the exhaust manifold, under the heat shield) and there are ways around that with little spacers.

If the smog man knows that there is supposed to be a cat there and does not see one there, dude will not pass it visually (at least not with out visualizing an extra $100 bill or two).

If the front cats are in place and working then it _should_ pass a tail pipe test with out a main cat.

The SES light being off and no stored codes for emissions things is essential to passing a smog test and that requirement would be satisfied.

Mike W

Last edited by Mike W; October 10th, 2008 at 05:19 AM.
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Old June 25th, 2007, 07:17 PM   #2 (permalink)
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Good post Mike... sticky.
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Old June 25th, 2007, 07:56 PM   #3 (permalink)
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Sooo.. Just get a straight pipe all the way back? Since there's no need to pay for a cat that isn't important.
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Old April 1st, 2008, 12:58 AM   #4 (permalink)
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some pics are broken :-(
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Old October 10th, 2008, 01:42 AM   #5 (permalink)
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This is an old post but just what i was looking for! so basically 4G has 3 cats, the one on the straight pipe can be taken off with no problems but the other two need to be replace with headers.

This is real good stuff, by the way the pics are still broken!!


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Old October 10th, 2008, 01:49 AM   #6 (permalink)
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Ahhh... old post indeed, but from Mike W =
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Old October 10th, 2008, 05:14 AM   #7 (permalink)
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OK, fixed the links and added some new info.

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Old October 10th, 2008, 07:36 AM   #8 (permalink)
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Easily one of the top 5 threads I've ever read. Good job and thanks
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Old October 10th, 2008, 02:16 PM   #9 (permalink)
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I agree!! For sure one of the best Threads!!! Great Info!!

Congrats!!
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Old October 10th, 2008, 07:03 PM   #10 (permalink)
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where could I get the injen full exhaust system???
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Old October 19th, 2008, 12:54 AM   #11 (permalink)
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good info. but what about gains and pros/cons for each?
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Old October 19th, 2008, 01:25 AM   #12 (permalink)
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where could I get the injen full exhaust system???

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Old October 19th, 2008, 02:05 AM   #13 (permalink)
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lets say if money wasnt an option, whats the best for power gaines and sound on a gs.
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Old October 20th, 2008, 11:42 PM   #14 (permalink)
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The best option is to get rid of your cats!! For sure!!

I Just took my main cat off and improved 2/10 on 1/4mile! But the sound was annoying and got a custom straight exhaust with the oem moffler!

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Old December 28th, 2008, 11:29 PM   #15 (permalink)
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Not a stupid question.... The golden rule is a axle back is better on a dual or complex stock system than a universal (in our case it is very very simple...)

The only real gains will be felt by no cats or cat back exhaust... But a cat back is very expensive for the gains u receive but u r planing on doing a super or turbo it is a great investment...

So my advise is to remove ur cats and get a axle back so u can instal it in ur driveway... Simple and it is all over

I'd craw under ur car and look how smooth ur exhaust run is... It is soooooooooooo much better than the Zs
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Old September 29th, 2012, 02:40 PM   #16 (permalink)
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this may be a dumb question but which side of the engine is bank 2 in? my rear o2 sensor needs to be replaced in bank 2 and im not sure which side bank 2 is on
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Old November 28th, 2012, 05:05 PM   #17 (permalink)
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Great info. Exactly what I was looking for.
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Old January 15th, 2013, 09:54 AM   #18 (permalink)
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Thank you so much! haha this helps me alot. Im hopefully doing a custom exhaust system in the next few weeks.
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Old January 30th, 2013, 09:47 PM   #19 (permalink)
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I installed a Magnaflow catback and the RRE header on my GS so I obviously can't pass emissions and my service engine light is on from the cat loss. Is there a way to pass emissions with putting the stock manifold back on? I saw something about spacers but I have no clue what those are.
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Old January 30th, 2013, 10:24 PM   #20 (permalink)
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RRE sells the spacers or just search on here they're around. And as always, keep in mind that any modification or removal of a cat is a violation of federal laws.
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Old January 30th, 2013, 10:34 PM   #21 (permalink)
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Is there any way that I could keep my header and buy a cat and pass emissions? I'd rather not go with the spacers and just have a cat to where I can pass
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Old March 27th, 2013, 12:02 PM   #22 (permalink)
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Does anyone know the length of te run of exhaust from the flange to the end of the resonator?
Looking for tips on how much piping to use. I want to have them removed. Both the cat and the resonator.
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Old March 27th, 2013, 01:18 PM   #23 (permalink)
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jack her up and find out!
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Old March 27th, 2013, 02:00 PM   #24 (permalink)
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It is mud season where I am, I was hoping someone else could do it for me, since I have nothing to stabalize the car with
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Old March 28th, 2013, 09:28 PM   #25 (permalink)
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I found they sell a 36" pipe at 2.5OD for $12 ill just pick up one of those and delete my main cat and keep the stock resonator.
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Old March 28th, 2013, 09:42 PM   #26 (permalink)
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Quote:
Originally Posted by PerfectCreature View Post
I found they sell a 36" pipe at 2.5OD for $12 ill just pick up one of those and delete my main cat and keep the stock resonator.
Who does?
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Old March 28th, 2013, 10:12 PM   #27 (permalink)
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ull prob want 2.5id for gt
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Old March 29th, 2013, 06:11 PM   #28 (permalink)
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VIP does for $11.99. 2.5 ID is what I meant. I found a shop to do it too, after about 7 shops declining me saying they won't remove it unless I have one to replace it with.
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Old March 29th, 2013, 06:18 PM   #29 (permalink)
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dam this was like one of the first threads i ever looked at on this site lol
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Old March 30th, 2013, 01:08 PM   #30 (permalink)
 
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Bank2 sensor2 location? On my phone right now trying to install these spacers. Stupid VA safety inspection won't pass with CEL's.
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Old April 2nd, 2013, 05:50 PM   #31 (permalink)
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Stock GT resonator is straight through design right?
I can't make heads or tails if it is or is not.
Thanks.
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Old April 2nd, 2013, 07:00 PM   #32 (permalink)
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99% sure it would be
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Old April 2nd, 2013, 07:36 PM   #33 (permalink)
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I thought so. I read a bunch of posts saying it wasn't. Wanted to make sure. I am having te main cat deleted tomorrow and I wanted to leave the resonator in as long as it didn't restrict much flow. Should pair up nice with the gutted precats I plan to do next month.
Thanks!
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Old April 2nd, 2013, 09:56 PM   #34 (permalink)
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yeah and if u dont get the tone u want u can always get an aftermarket resonator or glasspack in its place!
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Old April 3rd, 2013, 08:40 AM   #35 (permalink)
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Very true. Best of all, te gutted precats are free and the cat can net me some cash at the junkyard.
Thanks.
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Old April 10th, 2013, 09:05 PM   #36 (permalink)
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old thread i know lol, but the recent activity has got me looking at it again and made me notice something that is related to an old question i had which I could never dig up an answer through searching, a few people had guesses but never a solid answer from what i remember but.....

since there is no flange for a cat-back, it would make sense to me that a GT cat-back would would install similar to the GS cat-back on a GS. Im asking this because the price for the megan racing cat-back is closer to what i want to spend compared to the magnaflow. any insight is welcome and correct me if my thinking is wrong
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Old April 10th, 2013, 11:55 PM   #37 (permalink)
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old thread i know lol, but the recent activity has got me looking at it again and made me notice something that is related to an old question i had which I could never dig up an answer through searching, a few people had guesses but never a solid answer from what i remember but.....

since there is no flange for a cat-back, it would make sense to me that a GT cat-back would would install similar to the GS cat-back on a GS. Im asking this because the price for the megan racing cat-back is closer to what i want to spend compared to the magnaflow. any insight is welcome and correct me if my thinking is wrong
Is Megan the gt,and magnaflow the gs? Are you wanting to put a gt exhaust on a gs? And are you saying the gt exhaust is cheaper? don't really know the question your asking,but if it helps,just look at the piping diameter. You would have to get an adapter pipe to transition into the bigger exhaust. Not to mention the gs is exhaust is probably routed differently than the gt. I could be wrong though. If that's what your asking. Sometimes it's not better to go bigger with your piping,unless you got plans for the car.
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Old April 11th, 2013, 07:52 PM   #38 (permalink)
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Originally Posted by Itsa mitsa 08 gt View Post
Is Megan the gt,and magnaflow the gs? Are you wanting to put a gt exhaust on a gs? And are you saying the gt exhaust is cheaper? don't really know the question your asking,but if it helps,just look at the piping diameter. You would have to get an adapter pipe to transition into the bigger exhaust. Not to mention the gs is exhaust is probably routed differently than the gt. I could be wrong though. If that's what your asking. Sometimes it's not better to go bigger with your piping,unless you got plans for the car.
Yes the megan racing is for the GT and the magnaflow is for the GS. The megan racing is roughly $125 cheaper on ACI. Both piping diameters according to ACI are 2.5in (wouldnt even think about going bigger than that on a GS) with the magnaflow (GS) having a 4 inch tip and the megan racing (GT) having a 3 inch tip. OEM wise i dont think the GS and GT exhaust differ in routing, unless they just use the same diagram on the mitsu OEM part sites, but that is something i actually didnt think of. Im just looking to see if they install interchangeably, which id imagine since its a use of a clamp because of the missing flange. thanks for the input
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Old April 11th, 2013, 10:30 PM   #39 (permalink)
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ur honestly better off buying a nice muffler and tip and go to an exhaust shop...it will b ridiculously cheaper in the end I promise...unless ur doing it strictly for the stainless steel...in that case nobody will ever see it unless ur car barrel rolls...and if that is the case the last thing I would do is comment on ur shiny piping...juss my 2 cents
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Old April 12th, 2013, 04:08 PM   #40 (permalink)
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barrel rolls sound fun and all haha but yeah im just looking for the best approach for a college kid budget lol. the whole plan is to just do the common bolt ons and whatever smaller things that i can find to make it somewhat "quick", nothing big.

on the whole exhaust shop thing are you just suggesting buying a muffler and calling it a day or getting a nice muffler from somewhere and taking it to the exhaust shop to finish it off into a cat-back with whatever piping they have in the size I want?

My one buddy suggested taking it to an exhaust shop and hacking off the clunky stock muffler where the gasses circulate and have them just straight thru pipe that small section and slap a muffler on it for some sound, not sure how much benefits id find there.
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