These are the performance mods I have right now:

Air box mod with AEM filter, 2.9 pulley, 60# injectors, GM extrude honed header, magnaflow 2.5" catback, ZZP s3 HE / STU mod.

Would putting a ZZP 3" catted DP with 2.5" bolt up on my car improve performance??

I will eventually put a 2.8 pulley on the car.

 

Go catless

 

Cant, I have emissions to deal with!!

 

could u tell a big difference in ur catback over stock catback

 

Sorry cant answer that. I bought the Car with a Stage 2 kit on and a corsa sport catback. I didnt like the Corsa so I sold that and put the Magnaflow from my G5 on it.

 

O alright I'm on stock catback with magnaflow muffler

 

If you want it to sound like ****.. Sure.

 

Aaaaand, it didn't take long for the jackassery to come out.

 

actully i have 3 inch catless with gmpp catback and it isent raspy or way loud

 

I don't know man.. My buddy has a 2.5" catless and it sounds raspy as hell!!

 

Definatly bolt up a downpipe. Its going from flowing, to bottle neck, to flowing again

 

get rid of the gmpp ex manifold and put a header on it with a 3in dp with a cat

 

I got a 3inch downpipe and I'm waiting for my header but right now it sounds like **** inside the car cuz it's stock header the. 3inch catless dp then to stock exhaust

 

what header you going with