HKS w/ Berk hi-flow cat
 

I was wondering if anyone uses the Berk hi-flow cat with the HKS exhaust (ideally on an AP2). Does it kill the slight drone around 3k? And how does it change the sound of the exhaust?

Thanks :thumbup:

bumping...

Anybody done this? Looking to reduce overall decibels and kill drone on my 70mm hks single (currently w/test pipe) by replacing the test pipe with a Berk HFC.

No. I'm running the EVS 70mm hfc and 75mm HKS single. It's tame to me around town but with the top up and/or expressway drone is borderline unbearable(I must be getting old).

So much so I've been looking at singles that offer a reduction in drone(EVS or Cleib since it has a helmholtz) or even possibly going to a dual.

I feel like the drone is worse on my HKS dual when I switch to the berk HFC.

increase drone with Berk 60 than TP on Tanabe G

mikeyds, thanks for the reply. Did you switch to the Berk hfc from stock, or a test pipe?

When I went to the Berk 70mm from the stock cat with my 70mm Cleib single, there was a little less drone, but the exhaust in terms of decibels also got louder.

Test pipe. I recall the TP being louder overall and having less drone. Still have both and have switched between a couple times. I prefer the HFC because smelling oil at stop lights gets old, but I think the HKS dual sounds meaner with the TP.

Hard to find many Cleib owners. Any insight into drone w/ top up or expressway driving?