3" Pipe or 2.5"

1500 Views 15 Replies 13 Participants Last post by PhatTrax, Apr 17, 2003

chubz

Discussion Starter · Apr 11, 2003

My question is what better performance gains can u expect from a turbo back exhaust system (including Cat) in a 2.5" system vs 3" system.

From what I hear the slighly smaller pipe will give better Torque output than a larger diameter?

Also what about upgrades, I am planning on having the Stage 2 kit installed so that means a larger Turbo. So would that mean the 3" is a better pick?

1 - 16 of 16 Posts

cali

· #2 · Apr 11, 2003

www.atpturbo.com

Should answer all your questions.

mrmixitup

· #3 · Apr 11, 2003

Good link.

I'm going to wait to see dyno results of the various systems. I know Hector has already done a 3 inch and tested it.

chubz

Discussion Starter · #4 · Apr 11, 2003

AEM cold air Intake system

just checked AEM has a part number now for the SRT cold air intake system
Neon 2003 Turbo Only 21-425

Bah rechecked its tsill not available yet.

cali

· #5 · Apr 11, 2003

mrmixitup said:
Good link.

I'm going to wait to see dyno results of the various systems. I know Hector has already done a 3 inch and tested it.

hector already posted his dyno..its somewhere here.

el_jefe

· #6 · Apr 12, 2003

chubz said:
My question is what better performance gains can u expect from a turbo back exhaust system (including Cat) in a 2.5" system vs 3" system.

From what I hear the slighly smaller pipe will give better Torque output than a larger diameter?

Um, this aint a Honda, I dont think torque will be a problem for us. :lol: 8)

Black_Rain

· #7 · Apr 12, 2003

el_jefe said:
chubz said:

My question is what better performance gains can u expect from a turbo back exhaust system (including Cat) in a 2.5" system vs 3" system.

From what I hear the slighly smaller pipe will give better Torque output than a larger diameter?

Click to expand...

Um, this aint a Honda, I dont think torque will be a problem for us. :lol: 8)

Werd to that!...But yeah...my friend who owns a WRX just put a 3" turbo-back system on his car...he has driven his other friends w/ a 2.5" and he says he can notice a difference...dont know if that helps you or not...

Mike B.

· #8 · Apr 12, 2003

Absolutely, positively, without a doubt, 3"! One of the most important things on a turbo car is a large exhaust.

Vanilla_Coke

· #9 · Apr 12, 2003

Aye 3" all the way if your making power :twisted: GHL is using 3" tubing on mine... Man I can't take the wait.

ravencit

· #10 · Apr 12, 2003

Wouldn't the three inch make it real loud?

PhatTrax

· #11 · Apr 12, 2003

if it does, just get a resonator

Exhaust Depot

· #12 · Apr 13, 2003

My dyno results where flaud. I had the WG open a little. Ill get real numbers when my full system is done.

Oh, just so you know, a 2.5" system WILL support about 420HP before it becomes a restriction.

Corky Bells book , mAXIMUm boost has a good chart too:

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Forced Induction

· #13 · Apr 16, 2003

Definitly go for the 3" as you mod more and more you will regret not having it. With a turbocharged engine you want as big as you can get (dont listen to crap about backpressure). Anyone make a 3.5" ?

hemidakota

· #14 · Apr 16, 2003

Back pressure prevents that popcorn maker sound.

Osiris

· #15 · Apr 16, 2003

From all of my experiences in the past...3" is always better for a turbo car. Let that turbo rip

PhatTrax

· #16 · Apr 17, 2003

what about a dual 2.5"?

1 - 16 of 16 Posts

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