I have a question for all my fellow G owners. I am finally finishing all the mods in my sig. I have two of the mods installed already, the Z Tube w/ KN and the Motordyne spacer. I'm getting the UR crank pulley, DC SS headers, Crawford Cats, and JIC Y Pipe installed late next week. My question is what kind of gains can I expect? What kind of numbers do you all think I can post on a dynojet? I've seen some posts with dyno numbers in the 260's for RWHP and 250's for torque with similar mods. Do you all think I'll be in that area? Lastly, is there any other mods left I can do besides internals (cams, etc.) for more power? Thanks for all of your input.

 

Forced Air.

 

the cats and headers will make some big gains, there is more power with a good cat back exhuast, but there is more noise with that too.

I pulled 252RWHP/230Tq with my 05 At coupe (SAE corrected showed 262 actual)
with the spacer/ztube/stillen CAI/Kinetix Cats/Stillen Exhuast (I hadn't done the UR pulley yet, and I still haven't installed my headers) with my headers and pulley I would certainly think I'd be over 260. I also plan on doing port and polish on the intake manifold and plenum.