Trying to see what the best hfc for my 09 G37 sedan with stock exhaust would be. After doing a lot of research, I've come to find out that only fast intentions and aam hfc don't have the nasty rasp which I don't want. So between aam and fast intentions, which would you guys prefer with stock exhaust?

 

I ran FI RHFC with the stock catback for about a year. A little extra rumble, a little deeper tone, with a little more grunt. Very incremental, but all welcome.

It was a stealthy combo, using resonated high flow cats.

 

ya I hear nothing but good things about fast intentions. Do you know anything about aam high flow cats?

 

Nope. Been a while since I looked at this stuff. GL

 

Thanks man