..................

 

+1 On Long tube headers from Fast Intentions....Tony is great to work with!! Great product and great service cant beat it!

Seriously though on this topic...if money is no option Build your engine and TT over at GTM with a custom exhaust setup (once again i rec Fast Intentions) or you could always just do a supercharger with long tube headers and be done as well as save the extra time you would have to spend sending your car to GTM since more shops can instal the supercharger... anyway my $.02

 

arent long tube headers very loud, and also bypass the cats?

 

^^ yes and yes

 

then what r the gains from the stillen?

 

If $ didn't matter, I wouldn't have a G. lol

 

Hennessey Venom GT...

 

The STILLEN Z/G Headers are the finest available. With months invested in development work, these headers produce big increases in streetable power and torque on both naturally aspirated and forced induction vehicles.

The equal length design of the headers allows better and more efficient exhaust scavenging which contributes to the dyno tested performance gains. Examples:
- 2004 350Z produced 11.5 hp at @ 6200 RPM and 18.5-lb.ft @ 3800 RPM at the wheels
- 2008 G37 Coupe produced 14.5hp at @ 7300 RPM and 12.5 lb-ft @ 4200 RPM at the wheels

 

Any updates on this? Still doing some searching but thought I'd revive an old thread for more info.

 

Issue with the 14.5 hp and 12.5 tq gains are that we don't know if this was the only mod or if this had all the bolt ons... There is only so much power a car can get from bolt ons.

For instance if you install a F.I exhaust first you might get something like 15hp, now if you install a exhaust after lets say Intakes or headers or HFC/test pipes you gains will likely be a lot lower.