i have noticed that mine gets a bit of a smell sometimes, seems to be worse if i dont drive it often.
if i use it more regular like last week i was driving it to work every day , the first day the car smelt a bit inside and when i parked it back in garage first night you could smell the exhaust through the house (that was the first time it had been driven for several weeks ) as the days past there was less smell each day.
my exhaust has no leaks but it finnishes behind RH back wheel
i think that maybe its the carbon ? and crap that builds up in the exhaust from idleing around town.
need to find somewhere that i can open it up and clean the cobwebs out.