Originally Posted by kenpo_350Z

Good luck im interested in the outcome. What kind of numbers are the Stillen headers supposed to give?

Edit: Found this on their site.

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