installed my hfcs this week sounds great paired with sport muffler.

 

I was contemplating on this setup also. I have the OEM sport muffler and it's already quite loud imo. How much louder did it get for you when you added the berk HFC? And how's the noise level inside the cabin? Any drone at all?

 

if you drive normal its quiet if you get on it a bit it roars i am very happy with the set up and i would do it all over again. here is a clip with just the sport muffler, FYI if you do it make sure you do an ecm reset it will throw a check engine light if you dont.