View Full Version : I need some valid answers.. BT exhaust related

01-24-2011, 06:28 PM
Ive searched and read over 13pgs of info that was all inconclusive...

My current exhaust: highflow exhaust manifold, GT2860rs, 3in TP, 2.5in DP, which stretches to a full 3in again to a resonator and another glasspack. I like this setup, however, I live in CA...

I want to put on my HFC that is 2.5 in and out. I am thinking of cutting it and welding on 3in. in and outs and getting a 3in DP to make my exhaust a full 3in turbo back.

My question is: How much power will I gain by welding up 3in. in/outs on my HFC and fabbing up a 3in DP to connect to the rest of my 3in?

Or is my GT2860rs fine with 2.5 piping and the gains wont be noticeable? I know I am limiting my exhaust to the 2.5... But I am trying to justify spending ~400 on a 034 HFC and dp combo

thanks guys just trying to get the most out of my setup while living in a college budget

01-25-2011, 07:50 AM
I have the same setup GT28RS, i used to run 2.5" and now full turboback 3" stainless (no cat), i would say you can tell there is a difference. Numbers wise, i have no idea though.

01-25-2011, 07:54 AM
Numbers are pretty hard to guestimate. Your car will definitely be louder. If I were in your boat I would just leave it as is.

01-25-2011, 08:01 AM
^^yup louder. maybe i should make some drive-by clips.

01-25-2011, 11:32 AM
Yes you should^^ do it right now ; ) and maybe some start up idle clips with a few revs

Thank you

01-26-2011, 02:37 PM
Update: For future readers Who also need clarification.. I just spoke with the guys at 034 motorsports. I told him what my current setup is and what I am planning to do(2.5 HFC mated to the rest of my 3in exhaust) He said that HP numbers are hard to gauge. He also said that by switching from a 3in testpipe to a 2.5 or even 3" HFC the loss of power wouldnt be too noticeable with the turbo setup I have.