I have a got a 01 raptor 660 that has a 686 big bore kit. It has all stock exhaust on it, would it be worth spending the money on after market pipes and muffler, or just a muffler. It runs great I am just wondering if I have some more power that could be opened up

 

Pipes and muffler would benifit the most, depends on how much money you want to spend. I like the Curtis Sparks (sparksracing.com) on the 660, but they are loud, but sound great. They run about $570 for the whole system and you have to buy the jet kit ($50).

 

I have the monster inframe duals on my rappy. I definetly noticed a performance increase with them. The good thing about the monsters is that it leaves room for more mods later on like FCR 39's or 35's. With a full exhaust you will definetly wake that 686 up more.

The monsters were like $700 I believe plus quiet cores and jets. So almost 800 shipped with everything.

 

pipes are very restricting on the raptors so any aftermarket one would be good just depends on what you wanna spend, plus the airboxes on 660's are possibly like the worst designed airbox also so id make sure you got a good filter setup from GYTR ora proflo kit