I have a little problem. When my exhaust is gets really hot and I stop then take off slowly I can feel the exhaust rub on the frame. My friends looked under the car when I take off slowly and they said it shook a loot in the center portion. Going to muffler shop when I get my header and down pipe put in. How will the make my exhaust from moving around? and why would it only happen when it's really hot? My guess is it's because the pipe expands.