reminds me of one of the locals when I was a kid. He had a KD90 which went fine until one day he managed to crush the front section of the exhaust. No probs, just take the whole exhaust system off and ride it like that. Unfortunately it dropped the power output a fair bit, but the flames coming out the exhaust port at night time did look pretty spectacular. The exhaust nots was not noisy, but did have an odd squeal and whistle to it.