Popular cans for your sled are SLP, Skinz Super & Ultra Q, & MBRP.
Clutching and performance upgrades will depend on where you ride and how much you want to spend. Read the "Improve your IQ" sticky at the top of the IQ forum for tons of proven improvement info. Also add your location on your profile so we know where you live/ride (flat lands, low altitute, high altitude).