HFC is great if you want to amplify the stock exhaust and make it a little throatier. You will also get a bit of a power boost.

Guys quick question. Which gives more power. HFCs or Test pipes. I also saw something called Cat Pipes on the FI website and wasn't too sure what it is but FI claimed it produces most power?

 

Test pipes give better top end power, HFCs give better low end torque since N/A engine love that little back pressure, OEM cats are just way too restrictive

 

Anybody down to try Motordyne's new twist on the test pipe that they call "ART Pipes?"
Independent Review: Motordyne ART Pipes - MY350Z.COM Forums
Advanced Resonance Tuning (ART Pipes) MotorDyne Engineering

 

resonated test pipes aren't really that raspy

 

^Or double Res...

Thanks for the info Sam. So you like your RTPs over an HFC setup?

 

No one has tried them, they do not make them for the G37 yet.