my car has 20k miles and has never been on the track,but i drive it hard. It has an ECU flash and filter upgrade but nothing else. About 6 months ago I put Hoosier R6 slicks on the back.(not having the traction I wanted). I started noticing a creaking sound very near or involving the fire wall(not seats, doors, trim etc) on accleration from start or low speeds, then also when braking hard. I eliminated the clam shell as a source. I then took it in and had them retorque all the supports to the fire wall and pans underneath. This seemed to help a little for only a day or two but the noise recurred. Its not loud but definitely noticeable and drives me nuts......has any one else had this problem? What do I do? HELP bb