Reviving this thread a bit. I have my berk hfc paired with a non resonated FI exhaust. I do not have a hiss, except for decel at close to idle, normal.
Recently i started getting a metallic rattle clacking noise on acceleration or maintenance throttle at 2.5-2.8 k rpm. I can also be at a stand still and Rev it at that rpm and hear this rattle. It only does it after it has warmed up a bit and it sounds like it's coming from the hfc directly underneath. The sound is embarrassingly obnoxious to the point even the wife is asking what is wrong with my car this time.
I put my oen cat on and the rattle is gone.
Is my hfc failing?
My car sees frequent track days and canyon drives as well, so it sees a lot of hard driving.
I'm getting ready to gut this thing and turn it into a test pipe, any help is appreciated before I do this, thanks!
Last edited by Iammeowwwwww; 09-25-2022 at 12:51 AM.
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