I bought my 2002 used and the PO tinkered with it a lot. He was a heavy duty diesel mechanic. When I got it there was a "road draft tube" off the front of the engine with a heater hose extension? The bottom of it had a cloth secured with a zip tie and zip tied to the sway bar...I never asked the PO about it, so maybe there was a puke tank that he had discarded?