I'm looking at a cobb tuning flash, and to get to stage II, you need some kind of mod (like HFC or exhaust). So..does anyone just have HFC's? Does it make a difference? I didn't know it was so restrictive.

The stage II flash on a G37 yields about 10% bump in HP according to cobb.

Mike S.

 

I know that ShanesG has just HFC's with his stock exhaust, but he's got a 35, not a 37.

HFC will only make noticeable difference if you get a tune with all of your other breather mods.

 

^haha beat me to it...yeah 37's sound alot different than 35's with exhaust so i dont think a sound clip of my car would help much!