What pipes work, i already have a uni filter. My buddy put on a biggun exhaust on his and we really can't tell if it helped much. Is there a full pipe for the grizz from the head to the silencer.

 

HMF makes both a slip on and full pipe. The slip on was worth the money to me.

 

The intake is the major restriction on the griz. By modding the airbox like I did with uni vents, it really makes a huge difference. I used 12 vents and had to jump 4 jet sizes. It will blow your mind. The Highlifter outlaw clutch kit will also lower your gearing a little and it will accelerate alot better. It will drop you top end a couple of mph. It makes a big difference.