I'm looking to get a procircuit slip on pipe for my Raptor. Has anyone done that and have you been happy with it? What did you change your jetting to? Was it 145 to 150?

 

do a search for the pipe or you can search for my name and some info should pop up

 

I ran a T4 slip-on on my stock Rappy for two years. The elevation was between 300 and 1500 feet. It ran best with 180/185 mains, needle moved up one notch, 27.5 pilots, and no airbox lid. I also removed all the rubber engine shrouding in front of the airbox for more airflow into the airbox. The T4 performs just as good as anything else. However it's pretty loud.