Make you 600 rev run like it's a 700 or 800! This package starts out with our Stealth pipe mod or Fatt Azz single pipe. Both allow you to sound like stock running right into the stock muffler. Our pipe mod makes a huge gain alone of 7-8 horsepower! Now add our billet head kit for extra cooling and much more power. The Boyesen Rage Cages give you a great holeshot and the intake boots won't tear like the stock ones do. Then you get two 2" diameter flow rites for the airbox an finish the kit off with our awesome Stage 2 clutch kit. The whole package will get gain you 15-16 horsepower so you jump up to around 135 horsepower!! High altitude models use our higher compression 14:1 domes that add 4-5 more horsepower above 4000ft altitude. This kit is very reliable and a heck of a lot of fun to get this kind of power out of a 600cc sled with stock cylinders. You will surprise a lot of bigger sleds with this package, it really really works great! Please specify year and model of sled, whether it's an X package sled, and what altitude you ride at when ordering. Please remove the stock heat shield if you plan to send your pipe in for our pipe mod. Though only small fuel increases are required with this kit for SDI models, Boondocker EFI box recommended in most cases.