benefits from bigger exhaust piping

[sporty]

i need a little advice from the professionals in this forum.right now,the only restriction i have in my exhaust is the oem header.i have the same results from the peeps that have a header and leave their 3rd cat on.obviously i dont have a 3rd cat and my car pulls strong for it being a 4banger and N/A.my question is;would my performance go up if i went to 2.25" piping over stock ?and if so,how much do you think i would gain if any.right now i'm really satisfied with my performance and the piping will be the last thing i do before i start saving money for bigger plans but that will be a ways off and i am trying to get all i can get out of the car is the only reason i'm asking.so i would appreciate all professional opinions please.thanks in advance

[sporty]

guess it wasnt a legit question.i'm going in the morning to the exhaust shop and i'll see what happens after the upgrade.

[deadninja]

If you're going custom, you could explore the option of a true dual exhaust or is that an issue with our Eclipses? Either get custom fab headers for 4-2-2 setup instead of 4-2-1 and keep them split throughout the length OR leave the headers as is and break the exhausts into 2 pipes.

Good luck whatever decision you make!

[Daxenth]

im no pro but i know like 3 inch is max. after that its too free of a flow and you almost (or do?) lose power. so. id say 2.5 is your best bet man good luck

[sporty]

it will be either 2.25 or 2.50.thats what i'm trying to decide on beings how the cat back is 2.5" from RRE.but i dont have a cat.what my main concern is,i dont want to lose any power i have now but at the same time i would like the engine to breathe as good as it can with the oem header.not going dualls because thats extra weight i dont need and 1 of the things i took into consideration while i was, am, doing performance mods is making the car as light as possible.

[sporty]

oh,and thanks for the advice.

[Daxenth]

well making our car light, might as well toss that out haha. sorry to say but max you might be able to scrape out is a few hundred. if your lucky. our engine and body panels suck... anyway im gonna bank on 2.5.. like i said im kinda noobish but ive read alot of good stuff on 2.5, also, RRE headers. theyre a few pounds lighter and omg... if you can get lucky and find a member selling them pay whatever price they ask. lol. but IMO the best performance mod out there while shaving a few pounds. theyre pricey, yeah, but (i paid 330) the best hp for the buck. 15 horses instantly and a happier motor. tosses you back pretty rough too lol

[sporty]

the only bolt on im missing right now is the header and bigger exhaust pipe.gt tb,pulley,lighter wheels,3rd cat delete,sri,e3 plugs is working pretty damn good for me right now and i dont want to mess that up lol.and any amount of weight being removed from the car is nothing but good even though it is a small amount.lighter wheels means faster excelleration as well hence the reason i have them.i guess i could try 2.5 for a week and if i notice some power loss,i'll have to go back and put 2.25 on.

[Lanzerralliart]

Noooooooo I promise you will lose HP if you put 2.5 exhaust on. 2.25 is plenty for N/A , the turbo'd ralliarts are seldomly 2.5 most run 2.25 .....LSD only has a 2.5 and it's easily over the 300 hp mark yet the car isn't up and running yet.

2.5 on N/A you WILL lose that much needed low end torque...

[randman]

Kenny,
this has some good info regarding exhaust scavaging depending on what your goals are. ie: forced induction etc.

Serious Engine Performance Discussion

[sporty]

Thanks for the link bro.twas a nice read indeed.and thank you lanzarralliart.I went with 2.25 and noticed some nice torque. Steer.props to you both for the info! !

[Daxenth]

and props to me for shitty info! lol

[sporty]

Originally Posted by Daxenth

and props to me for shitty info! lol

at least you tried

[Ballfade]

lol