Hey guys anyone could share which brand of HFC installed with aftermarket exhaust will not have any rasp?

 

HFC's have very limited rasp, virtually non existent, compared to test pipes. Should be okay with any that you choose.

 

I have crawford HFCs and while running there isn't any rasp and no popping on deceleration

 

Ok. better flow than stock cat and sounds louder as well right?

 

butt dyno approved and slightly louder

I have crawford headers and nismo exhaust and I loved my exhaust note, these just added a little bit extra and "feels" like more mid range torque

 

Right. The gains will be minimal on a NA vehicle but would work well with a tune and exhaust.

 

The quick answer is this:

(VQ35DE)
http://www.fastintentions.com/produc...roducts_id=104

(VQ35HR)
http://www.fastintentions.com/produc...products_id=68

All the benefits of HFCs with a more stock-like sound and no rasp.

Rasp will also have a lot to do with the mufflers/resonators (if any) that are being used in your cat-back and the particular design of the system. For example, my Motordyne exhaust had no rasp with the Berks, but my stock exhaust sounds like $hit when cold (tons of rasp) and then slowly disappears when everything heats up.

 

Fast intentions makes high flow cat with resonators. That's gonna be your best bet