.
Yes. They make a Big Bore kit for the Pred-90. They make performance pipe, performance reeds, performance CDIs, performance clutches, etc. etc.
The folks I would contact for these parts are:
Billy Holt at
http://www.wrhracing.net/contact_us
Ed at
http://www.lucky7racing.com/
Rich at
http://www.hetrickracing.com/
Note: When chatting with these folks, do fully explain your wants, needs and riding conditions. They will match the proper performance parts for your needs.
For me, I went with a Big Bore and kept the factory pipe. Probably not the most efficient upgrade (for obtained power) but in my area, one must run a factory pipe. Noise level thing.
--------------
When installing a new pipe, many also recommend an upgraded CDI and Clutch Kit - at the same time. The clutch kit allows the engine to rev higher (tuned for the performance pipe) and the non restricted CDI allows the engine to rev higher then factory. For even more power gain, many also recommend an upgraded air filter (re: K&N, Unifilter or foam filter) to allow more air into the engine. The biggest air flow restriction on the Polaris 90 is its straw intake and restricted factory pipe.
For details, surf:
http://www.off-road.com/atv/kidskorn...vupgrade3.html http://www.off-road.com/atv/kidskorn...vupgrade2.html
Note: Before ordering, provide them the exact year of your Pred-90. There's different pipes for different years - due to the Reverse gear in the 2005+
Hope this helps...
.