[Sapphireho]

Originally Posted by humfrz

Maybe it's like what happened to certain police SUVs, that some holes were allowing exhaust fumes into the vehicle. If that's the case, I'd suggest you plug up any suspected holes around the rear of the car.

OR, find and fix the exhaust leak.

OR, extend the exhaust system -

That's at Laguna Seca. Point it infield.