Dave Ett wrote:I read it that the exhaust port on the bike is restricted, not the downpipes, hence the angle grinder..."

"Head pipe", "downpipe", "down tube", call them what you want!

Matt@TYGA wrote:If you've got a 28 but think that the stocker 21 pipes would work better then you're right to a point... ...the head pipe has a bigger inlet. 40mm on the 21 compared to 30mm on the 28... If you want a simple 4 hp then get your rotary grinder out and whizz the ring out to 40mm.

The MC21 and MC28 barrels are interchangeable. Fit '28 barrels on a '21 and your exhausts will still fit.

Changing exhausts is a different matter. It's usually the swingarm that gets in the way. I was under the impression that MC28 race pipes would go on the MC21, however one side would touch the swingarm a little. I guess I will stand corrected on that one.
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Andy.
NSR-WORLD.COM

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