Do they make an after market exaust for an 01 300 4x4?

 

Other than the universal systems, as far as I know no one makes one. Why do you want one? Even if you had a 10% power gain, unlikely, you wouldn't be helping the motor in the place you need it, the low end. This is a grunt bike. My 2001 250 only has high and low range, but with it in low range and a proper use of throttle has gotten me over everything I've run into. And that's been some pretty nasty cross country stuff and a week ago up the side of a 2000 foot mountain with 2 up.