I bought this downpipe last night https://www.cobaltss.net/forums/parts-66/gen-1-projectors-zzp-custom-downpipe-200-miles-224701/ and im going to put it on my car when i install my trifecta stage 3 either next week or week after. right now i have stock exhaust with magnaflow muffer and im going to probably by ca v2 header. will it help much without header compared to stock and will it do much more with header on stock catback.

 

It will help. It wont be very noticeable power wise, but it will be pretty loud.

 

bump for anwsers.

 

On my LSJ, I didnt notice much with the header, then when I added the exhaust, I was like yeah I feel this a little bit, then I added a downpipe, and felt a good bit of gain.

 

icic im prolly gonna keep stock catback get the header this week. i should have some gains i got magnaflow muffler on it. i dont think its really worth the money right now to buy a 2.5 exhaust