Ive had berk HFC on for about 2.5 years. With berks, and probably other brands, we get a hiss sound when decelerating...this is with stock exhaust. However, with HFC you will get some hp, and a slightly louder exhaust note.

if were still meeting up on the 19th at chilis, youll be able to here it.

 

i have berk HFC and love them notice a diff in power with them..

 

hfc are the best sound wise too

 

I have the ERZ HFCs with my FI CBE on the sedan. They were real raspy with the stock exhaust, but when I paired them with the FI CBE = sweet, sweet music!

 

Resonated Test Pipes get my vote!

 

I got Kinetics on my sedan paired with the Stillen CBE, it sounds soooo sweet. Though its a bit loud for my taste and thats why i have ordered the invidia, the sound is awesome. I estimated that i picked up about 9whp with my tune. But since i got my sedan tuned with all the other bolt-ons; intake, cbe and hfc, i can't really give you am accurate number. My car puts down 289whp.