It hits around 240 at the hottest, im riding a 99 GT V6 3.8 sedan, and its just outside at first but when the car gets up there i start smelling it inside just a little(may be due to window being down)How hot? Which car and motor do you have? What year? Do you smell the exhaust while in the car driving? Is it in the cabin of the vehicle or from the engine bay or out of the exhuast?