[Orange whip 04]

If you think it is related to the exhaust I want to suggest that perhaps you might have a possible cracked or broken subtraight with in the cats, maybe a piece of the substraight is just bouncing around inside the cat which will not escape unless it fully crumbles apart. That is if your still using cats. I can also suggest that a broekn piece of the chamber might be rattleing around inside your flowmaster. Does the rattle happen over bumps ? It could be the pipes rattleing, rubbing, underneath body and you might not see this with the load off the wheels. Or perhaps the rattle is unrelated to the exhaust. Could be another part of the car that is rattleing in which the people looking at your mach may have thought they were looking for an exhaust rattle. They must be able to verufie the rattle first in order to make the repair. That is all i can think of.