I have berks hfcs and never a CEL. When i first installed my berks hfcs the sound did change a little. On start up its a little loud but gets quieter once its warmed up. While driving normal i can hear the hfcs but just enough to know they are there. And while driving crazy foot on the peddle wow sounds amazing! It gets a little loud but also a little deep. I also have stillen G3s. Now im waiting on my axle back beluga muffler part.
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