Berk HFC's problem
 

So I got my HFCs installed and was happy with them at first except that there was a rattling from my y-pipe hitting a support on the bottom. Well I got that fixed and I loved the sound and I definitely felt more power. As of recently though at a certain point when I'm at WOT I hear like a squeaking noise, hs anyone else had this problem or what do you guys think this could be. Btw I have the stillen exhaust as well.

Hmm...I wouldn't expect rattling from the Berk pipes because they come with the support bracket unlike some other brands. I was also thinking of going for the Berk test pipes, but this may deter me from getting test pipes.

I think it would be a little difficult to diagnose the issue based on your description of "squeeking". As an Authorized Dealer of Berk Technology products, we have never had this issue with any of their products that we have installed, nor had this issue with any of our customers that installed them themselves.

I feel you are being a little unfair with your Thread Title...you said it yourself, you are running the Stillen exhaust...why not title it Stillen Exhaust problem? Just sayin....

Find out what the problem is before pointing fingers at the manufacturer. It could be something completely different! "Squeeking" could be caused by MANY things!

Which support was it hitting on? How was it fixed?

I ask because I have a clearance problem with the Berk HFCs and Motordyne XYZ on the G37. I've got a temp fix by connecting the passenger side XYZ pipe as low as possible to the HFC (i.e. the flanges are not vertically centered) to avoid hitting (what I think is called) the rear engine mount member (black metal cover between the HFC to Y pipe flanges but slightly off center toward the passenger side).

I am not saying the HFCs have the proble
But it definitely is not the exhaust because I had the exhaust prior to installing the HFCs and the y pipe sat in the same spot and never rattled. The problem came up AFTER getting the HFCs. Also it isn't a squeaking so much as a little screech. I'm just asking as to what could have causes this maybe it was where I installed it or the part came defective, I don't know. I'm just looking for some input, period.