David, I wasn't in favor of dual pipe design either, what I was getting at is when you split 3.5" pipe at rear end, better choose two smaller pipes like 2.5", so that you don't lose velocity. Bigger cross section downstream makes no power.
At the end of the day, the execution of this 3.5 design is one and only in the business and highly respectful.
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Lemania 2320
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