So I've been trying to track down the exhaust smell coming into the cabin of my 2005 Dodge Neon when not moving. Yesterday after a long drive i let it idle popped the hood and could smell exhaust at the back of the engine, not sure if it's a leak in the exhaust manifold or the pipe that connects to it. The exhaust is not smoking so, how or what methods can I use to find the leak? I'm starting to get this tracked down but have never had this happen on any of my previous vehicles. All help appreciated.