I raced a NSR for a couple of years, a 1989 MC18 with various MC16 and 18 engine bits.
I put some racepipes on it, and was impressed.
Then I got an Aprilia RS250.
I put Tyga's on it. Impressive.
I put PJ38's on it, off a 1990 Honda RS250.
Mate. I wish I had done that to the NSR!!
They give at least as much as putting the pipes on did, and its a heap easier to work on them. (They're in a enclosed fibreglass airbox)
Sorry for hijacking this thread, but it is relevant
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The Chopster