For those with experience with the Invidia Q300 catback for sedans... what would be the best HFC to go with? I want something without rasp. I came across a deal for FI HFC's with the option for resonator size. If I went with this, what size should I get? I know the q300 has resonators, but like I said above I'm looking for a setup with no rasp. Just a clean exhaust note. Any help guys?

 

Almost any HFC's are going to cause more rasp on these motors. Resonators will probably help a bit but you will still probably make your exhaust more raspy.

 

Hate to bump an old thread but my new thread would have been the same. Have a 12 6mt sedan with R2C and Invidai catback. Have decided I want a little bit more bark and pop on shifts but deeper and louder with zero drone or rasp. Not sure if I want the hissing either. FI RHFC seem to have the most votes, with Z1 and Berk following behind. Won't be tuning and my state has emissions. So...recommendations? Thanks!!

 

You really need to tune if going high flow cats or test pipes. Also, you will not be emissions legal so probably not the best choice. Either modify your current exhaust to increase sound levels, or go with a different system that gives you the sound you want.