I have a Wileyco exhaust that just bolts on to the exhaust flange to replace the stock exhaust can. Although, you can check ebay for the same brand, there should be other brands that just carry bolt on cans for our model years. Good luck!
DO NOT start hacking up your stock can. There are two baffles in there and if you cut it, you will just have a big paper weight. It is not a straight through design. You are not going to find a system/slip-on for the budget you have in mind unless you get a headder and weld up a headder-back system and fabricate a can. You can get a high flow baffle and packing from Muzzys for like $18.00. Every thing else is just metal work and patients.
A forum community dedicated to all Kawasaki motorcycles including the ZX-6R, KLR 650, Ninja 250, Ninja 250R, and Vulcan. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!