will be as brief with this one as possible. Considering a rev pipe for my 01 200. Have read here that the stock pipe uses double wall constrction to reduce noise. I suspect it is also for another reason. The kdx is meant to be ridden at a variety of speeds, not just flat out high rpm racing, and because of this, the double wall pipe construction most likely is also done to help the bike from "falling off the pipe" too easy by retaining the expansion chamber heat better. If not familiar with this term, it basicly means, when you slow the motor down, the pipe cools slightly, if it cools too much the motor will tend to miss or sputter slightly for a few seconds when you get back on the gas untill the expansion chamber heat comes back up. My only experience with this problem however has been with putting aftermarket pipes on snowmobiles operating in much colder temps and not bikes, so I dont know what to expect here. The situation can be quite annoying, and Im not interested in wrapping the pipe to get rid of the problem. My question is, has anyone noticed after putting the new single wall construction aftermarket pipe on that the motor tends to be more finicky, and tends to miss or sputter for a few seconds after you have slowed down and then get back on it, or has it not been a problem?