rgvsean wrote:92 hp? Not so sure about that. I'm no expert so maybe you should ask around.
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Here's the link 92 poneys,

http://www.bdkraceeng.co.uk/ExupValve.html

if you go to the main page youll see they like the FZR400.. Mind you these guys are good with 2 Strokes as well, there setting up my mates RGV500 harris right now, will be ready next week.