well it will perform its function, however it just wont perform as well as steel. steel will reflect exhaust pulses stronger than carbon fiber, and even aluminum. titainium will work well too. and since we are talking 2 strokes here. reflected exhaust pulses are very important from a tuning standpoint to obtain maximum performance. your cabon fiber exhaust stayed cool to the touch and worked ok because 1 carbon fiber is not a good conductor of heat, and 2 while i dont know motorcycles those sound like 4 strokes to me, which are an entirely different beast when it comes to tuning. for a 2 stroke you want to retain heat in the pipe because it helps to draw heat out of the engine, everybody should agree that a cooler running engine is a plus. since the steel reflects pulses better it will make the backpulses in the motor push the fresh mixture back into the sleeve helping both power and fuel economy. I'm not trying to get in a huge debate here, just make people aware of why different materials are used, and the effect that they can have on performance. ill also add, that since i stated aluminum wasn't as good a choice as other materials, there are MANY different alloys of aluminum that will perform differently, and wall thickness also plays a large roll. aluminum is easy to work with and thats why a lot of very high quality pipes are made of it. the manufactures simply manipulate the alloy choice and wall thickness of the pipe to obtain charicteristics that arent that far off from a steel or titainium pipe.
