rc46 wrote:"With NSR's its not an issue" sorry that sounds horrid. But apparently the Honda exhaust is so good that even an after market system will get you maybe an extra 2hp at best,

Yep, the 21 pipes are superb and i believe the '18's are good to, I think Bill's seen something like 66bhp with them on his '21, the '28 pipes however are a proper restriction
Tyga got 12bhp with just a pipe change!
http://www.tyga-performance.com/images/MC28-Std-v-TYGA-Pipes-RO.gif
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