Which HFC to get?

[harp00n]

I have Borla cat-back exhaust on my G35x '07 and I want to add some power to my car, so I decided to buy some HFC.

The question is, which HFC produce less noise and raspy sounds? :hello:

I wanted to go with Berk's HFC, but some people say it would make raspy "chimes" sound around 1800-2500rpm with my cat-back, which is already LOUD enough...

[srv2nv]

No matter what they're going to add some volume. Some might add more than others (usually higher flow means less obstruction and greater noise...not always with mufflers, but I find it holds true with HFC's). Go with something that would be 50 state legal or close to that and it should give you less rasp. I went with Kinetix Racing HFC's and couldn't be happier.