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If the design is like other similar muffler deletes, the driver's side is much smaller than the passenger side. Most of the exhaust actually goes out the passenger side (I had a Berk and have a Works). So I think it may be a restriction and cause high RPM power issues. Measure the most restricted part of that exhaust and if you can, have it bored out or drilled out as much as possible so it's no smaller than 2.25"
Like Williampreza said, you could make a helmholtz out of it. If it was me, I think I'd lop off the pipe right there and leave it open or even better, drop $150 for a berk single exit
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