What should I expect?
 

Ok gang. I have a 2012 2ss/rs ls3 m6.. Here is what I am thinking.

Kooks 1 7/8 headers
hf cats
Vararam CAI
and a Tune.
What kind of rwhp numbers should I see from this?

my other option is to add a Borla touring exhaust. is there an HP difference in the Axel back Vs. the Cat back? and if so how much would each of these add to the set up above?

any and all input is welcome..

and I am going to be on a Dyno jet Chassis dyno.. just so you know

If you go to the dyno thread you can see pics of others that have dyno'd there cars. Just find one with the closest setup. As for the difference in HP, from the Cats back you won't get a gain in HP. It's all in the headers and cats, whether you want to run Highflows or catless.

415-424 rwhp.

410-415 rwhp

That's typical for that setup.

420-430 bc of the dyno jet. They are normally much higher numbers than other dyno's