Honestly man i'm not sure about the Berk's. I have the ART pipes and i've been on them for about 500 miles and had no issues thus far.
Here is the problem, as you asked... yes it will affect performance. What I would do is take the old gasket, and mark the circle on the OE one and then dremel it out with a sanding drum. That's probably your best best IMO.
To add to this, I had messed up my gaskets from my ART pipes, but not following my CBE instructions, so I had to go search for new ones... I was amazed by the diameter difference. I believe pretty much all aftermarket exhausts are 2.5" i'm not sure about OE... I want to say 1.75" but i'm not sure. Either way, if disrupts airflow and will indeed inhibit performance... if only by a small margin, but who wants that?
Last edited by Methodical4u; 09-13-2011 at 04:53 PM.
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