My exhaust suddenly got more quieter. I have a straight pipe and its cammed. at idle you could hear the cam and while driving, the exhaust note wasn't too loud but still enjoyable. Ever since I stepped on it one time while driving, a day later the exhaust just got way too quiet. Took it to a shop and they fixed a leaking exhaust gasket but it still is quiet. I'm hoping changing out the fuel filter will solve this. It needs to be changed already so maybe could be the cause?