thedragon

I have a single flowmaster AT series muffler and have been having a problem. Every time I start the car and get up to 1000 rpms i can hear this noise like metal on metal and the floor vibrates lightly. I have no idea what is causing this and its getting very annoying any insight would be greatly appreciated. Thank you

jdphillips73

well, its most likely the clamp that holds the muffler on...i know i had to torque the sh@t out of it when i installed mine flowmaster at. then after about 200 miles, had to tighten it again. then a year later, i had to tighten it again. Even when you think it is as tight as you can get it, i had to put a cheater bar on it and tighten some more.