I have heard of ppl putting tractor mufflers on there 4 wheelers anybody hear anything about this crazyness??

Yes,

GO to tractor supply and look at the F014 (I Think) It will fit the bike in your sig with a few modifications.

Why in the world would someone put a tractor muff on their bike.......

 I gotta know.

probably cause its alot cheaper than a brand name one

atvmxr:

probably cause its alot cheaper than a brand name one

Its still not as good as a aftermarket pipe but better than stock

Ok ok I would love to see some performance data on a bike with one of these. I mean you can buy aftermarket slip ons pretty cheap but if it works ok. but what about tuning your (air / fuel ratio) to match something like this??

 Or do you not have to tune to it??