What exhaust systems are you guys using and what kinda HP gains have you seen with these modifications? What do you suggest? (On a 3rd Gen)

 

Horsepower gains really depend on what other modifications you have on the car.

The best exhaust is really based on what you want. If you want more a stock and quiet exhaust lots of people like the M2, Racing Beat, Apex'i N1 dual

The next step would be like a Pettit, PFS, single M2, Greddy etc

If you want a better performing...but loud exhaust there are the Apex'i N1, HKS Hiper, Blitz Nur Spec, and Tanabe Racing medalliion.

 

If you want all out power and don't give a **** about noise......HKS 4" Titanium racing exhaust!! I have it on my car and it breaks the tires loose every time the 2nd turbo comes on.

 

Rage, How much power are you working with on the ground? And new question, if you guys had to do it all over again what road would you have taken as far as intake/exhaust/upgraded twins/or single turbo for the most cost effective power gain?

 

I got the apexi N1 and it is great. Not too loud either. The apexi n1 dual is not quite, it is louder than the N1 single. Check my sig for exhaust (I would not have done anything different) and I would go with the apexi air intake if you are keeping the twins. I would and will go single for lots of hp and it is more reliable. Check out the dyno curves for singles vs. twins. Big difference, the single is steady and smooth while the twins are jumpy and drop off when the primary dyes out letting the secondary pick up.

 

I hit exactly 300 rwhp last year but with an apex gt exhaust and stock intercooler. I'm pretty sure i can get 320+ now.

 

Rage,

How much boost are you running?

 

When I dynoed it last year I was running 11 psi. I'm running 11 on the street also.