Hey guys I recently bought a yamaha warrior off CL for 200 bucks. It wasnt running when i bought it but a few carb fixes and she purrs like a kitten. I was wondering what you can do to these four strokes to get some more power out of them. I am assuming intake and exhaust. So open air box drop in filter and slip on exhaust? I was wondering if you could fabricate a 4 stroke muffler for performance if you are on a budget and don't want to drop 250 on a slip on muffler. Thanks !