okay okay whats the best exhaust for performance wise? something that can handle the high flow of straight pipes. does HKS high power exhaust connect straight to the headers?

 

i think my straight pipes have to much flow for my exhaust to handle

 

hks with hfc, i was think of getting the injen but it drones too much for me...so ill be getting the hks or the f.i.

 

No it connects to the test pipes or HFC... HKS will rasp with test pipes.. search it on youtube

 

There all provide about the same gains in HP and TQ, But look into Motordyne's newly released exhaust setups.

All exhaust even OEM, can handle test pipes.

1) G35's comes with exhaust manifolds, not headers.
2) The HKS, and every other aftermarket exhaust that I seen for a G35 or 350Z, is a Cat-back. Meaning they connect to the OEM cats, HFC's or test pipes,

 

^^^ not every exhaust for the G and Z is a catback