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?

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...

 

FI HFC is what u're lookin for !

 

if your Exhaust is already loud enough prepare for it to get even louder, and drone even more..... I agree with Glover, FI is where its at!

 

it will be A LOT louder, just like everyone else said. i have stillen i wouldnt recommend it. not because of the sound but because of the fact they dont send out foulers to you right away they make you use it and then you have to call them to tell them you got a ses light. FI and Berks include them right away

 

I have Stillen HFC's and even the foulers didn't cure the problem. Every 4-5 months my SES comes on and I have to disconnect the battery to re-set it.

 

not to thread jack

but here

https://g35driver.com/forums/v36-diy...t-hfc-fix.html

 

Thanks, Suby. I guess I never saw the update when you changed to 2 extenders. I'll give it a try.

 

Hmmm, i'm getting Invidia HFC for my Invidia exhaust, i like it that way, they are 200 cell metalic core, berk and FI got 250/300 cell metalic core, Invidia flow more, but it would be like 0.5rwhp i guess .

 

what if adding kinetix HFC??

 

FI HFC's is the way to go!! Had them on my car for almost a Yr, and no problems at all with CEL!!! And this is with my Stillen Cat-Back. And can't beat FI Customer Service! Which is awesome!

 

HEY DUDE!! what happened to the RTP's? I thought you were going for them instead?

 

Check the date, it was 2 days before i bought it, i made a poll about getting HFC or RTP, people voted RTP.

 

Ohhhh lol ok, so you're still getting the RTP?

 

Yes, but i don't know when, it's back ordered everywhere :s.

 

Damn, lets hope it doesn't take as long as my Berks HFCs lol. Mine took over 3 months to arrive, all because of the stupid person I bought it off, never again going back to him.