To clarify - are you smelling gas or exhaust?
If it's gas, don't give up yet. As for mine - I was wrong it is not heat related. I can smell gas as soon as I come to a stop with the car cold. I jumped out of the car and with the motor still running stuck my nose everywhere - in the tailpipe, in the filler door, under the hood. When idling it is very faint, but it is coming from the area of the charcoal canister.
It might be the purge solenoid is dead, leaving the charcoal saturated, or a leaky fitting or hose on the canister. I think I'll let the dealer take it from here. Does anyone know if an aftermarket muffler voids the warranty?