No the 28 has restricters at the headers. They cut the area by about 30% and are a pain to grind out as they're made out of 'cheese metal TM' which clogs up grinding stones. A RH 21 pipe will fir the 28 which would get rid of it and the LH 21 needs to be modded where it passes the single sider. Not a difficult job and the 21 pipes are pretty much free...
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NSR300R - Why did i ever have a 250...