What do you think about that. If i upgrade my exhaust would be the car a bit better in acceleration , the reason why i am asking is because they wrote that injen exhaust increases horse power with approx. 15 RWHP, which should be felt on the car easily esp. on the acceleration. and something else my Z in 2007, should i wait a little bit until the summer lets say, and then upgrade the exhaust or rush now and get the injen ?? thnks

 

i would get it right now if you have the money but ya would feel a diffrence in the cars acceleration im sure. i plan on geting the Injen SES Exhaust as well and have done alot of research on it and from the looks of it eveything is a-ok. Plus if the Injen Cold Air Intake gave me a boost i feel im sure the exhaust will to.

 

Regarding horsepower claims, please refer to the intake/exhaust rules sticky.

If you get an exhaust for your 07, it would be GREAT if you could do a before and after dyno. I'm sure everyone is wondering what some of the "classic" exhausts are capable of making hp-wise on the 07's.

 

Not to hijack the thread, but the Greddy EvoTT has been proven to show gains on an '07. Just a thought.

 

The 2007 OEM exhaust is a nice system. Headers look great. So does the dual cat back. If I was searching for performance, I would get rid of the catalytic converters.

 

Man the evott sounds like **** on a na 2007
Ricey puke...
Besides, the Z sounds the best with a resonating chamber (nismo, borla to name a few)
Best power will not come from dual 70mm piping with no crossover but if you whant dual its for na 60mm max, or if you go 6-2-1-2 you whant 70mm,
Hope this helps.
P.s cats or test pipes are not out for the 07. they yield about 7-10 whp all over the powerband.