Im wondering what are the best exhaust, carb and intake mods for a raptor 660. Have heard good things about monster duals and sparks single exhaust. Any performance difference between them.

Im going to be in the Fort Irwin California area with this bike, what carb/ jetting would work best there.

And open airbox or closed with holes drilled? what air filter should i run?
Thanks

 

There are forums dedicated to Yamaha 660s and 700s. I would definitely check those out. Just remember opening the exhaust or airbox will require carb adjustment. Do small changes at a time or you'll get frustrated by a machine that doesn't run.