I installed the heat muff on the #1 exhaust tube per my plans. I have the complete FWF kit from Van's, with an IO-360-M1B. Everything went toghether well, but the entire unit can rotate on the exhaust pipe and also slide back and forth about an inch. Is this normal? I tightened the hose clamps up pretty tight, but it didn't help any. It seems that the way it is now there's nothing to secure it in place. Am I missing something?