From the myg37 forum.
"Invidia HFC is the best quality HFC I've ever seen."
"I have the Invidia HFC's on my 09 G37X Coupe AWD, fitment is perfect. Sounds decent. Power is definately improved, i also have Stillen Gen 3's
I had the full Invidia Gemini Exhaust, even modified it to fit around the AWD unit, and wife complained car was to loud and woke the kids, so had to go back to stock. Exhaust is for sale in classified section if anyone wants one."
Most all HFC's function the same, there won't be much difference in sound or performance from that component as most of them are using the same cores.
Changing the exhaust alone increases volume slightly but mostly gives a better low end tone. Adding HFC on top of that may increase loudness more than you want. You can't tell loudness from a video either, you have to experience it in person.
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