Just bought a 97 bayou 300 4x4, it runs good in first, but doesn't have much power in the higher gears. It is missing the stock muffler system. It's supposed to have a pre muffler and then the regular rear muffler. I tried a muffler off my 300 2wd but it didn't help. Is that missing premuffler the cause of my no power issue. Already tried different carb, and checked the valves.