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OK I think most on here have the same problem, the exhaust leaks at the head and causes the bike to back fire, I fixed mine a few days ago, seems to still be fine after a hard day of racing, the way I fixed it was I removed the pipe from the bike, (gotta love KTM for making an exhaust you have to pull the rear shock to remove) after you get the pipe out of the bike remove about 1/8" of the female flange on the pipe, this is the part of the pipe that slides over the male part on the head, what this does is allow the tappered flange on the pipe to mate with the male flange on the head, I used my cut off saw but a grinder would work, I put it all back together with a little high temp RTV on the outside of the male head flange, done no more leaks no more back firing!!!