My friend just got an 01 raptor and that thing is fast but he wants to know what type of pipe is best for the raptor. I think he just wants the slip on and not the full exhaust. It already has a K&N, but I am sure it will need to be rejetted with a pipe, thanks.

 

tell him to try removing the spark-arrestor and the quiet core insert first.....
it's free, and it should help alittle

he can also remove the flaps in the snorkel which restrict airflow

then up the main jet a couple of sizes... what's that like $8 or something?

maybe spend $15 on a one tooth larger front sprocket if he wants more top speed and less front-wheel sky-ing

 

thanks DSAPP, I will see if he wants to try opening up the stock pipe.