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Keith, you lost me on that "sealess rear crank opening". Would you please explain that. I had problems with my exhaust coming back into the cabin when I originally had my stinger exhaust pointing straight back. The air flow is rather turbulent and, from my observations in using the manually operated WindTunnel 55 test equipment (drive down the Interstate at 55 mph and see what happens :) , a good amount of air travels up from the underside of the vehicle and curls up, flowing mostly up to the license plate and lower window area. Well, more so when you DON'T have a lower apron! So, if the exhaust or any other fumes coming from the engine enter into this airstream it's pretty easy for it to seep into the cargo area thru poor seals. Make sure all seals are whole (not "holie" :) and keep the exhaust pointing to the outside. I'm willing to venture a guess that if the foam in the D pillars (the rear-most pillars that have the vents in them) has rotted away that the smell may become noticeable. The foam keeps water from entering the cabin at high speeds (personal experience speaking here) and probably acts as an air diffuser, keeping sudden pressure changes from occurring. How you replace this I do not know. Why is this smell during deceleration only? Probably a sudden rich condition when letting off the accelerator pedal? Beats me. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- >...opposite side so maybe its coming in there. Its NOT a leaky >exaust as my system >is rock tight but maybe eminating from the sealess rear crank opening?? >Definately bears some real detective work. ...