Andy wrote:What Matt is trying to say is that if you have an MC28, modify the downpipe to liberate a little HP. Your stock MC21 pipes don't have the same restriction as the MC28 pipes.

Is he? I read it that the exhaust port on the bike is restricted, not the downpipes, hence the angle grinder...

When I ordered some TYGA pipes for my 21, I was sent 28's by mistake, and they simply will not fit. The head angle was all wrong, and the lug was in the wrong place too. I guess the motor is in a slightly different position?
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