For all of you who haven't seen inside on one of these GRP engines yet, here, compare it your Ninja. I already dumped mine, so I can't tell.

http://www.smp-racing.com/index.php?...mid=32&catid=4

http://www.smp-racing.com/index.php?...mid=32&catid=3

I do think its been reworked or finessed. I do remember looking at the Ninja sleeve when I had mine. It looked rough compared to this sleeve.