You need Dale's exhaust fume blocker. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
The Windblocker Moss sells or anything like it that will block the wind from coming into the cockpit from behind will also get rid of the exhaust fumes that tag along with it. Assuming of course that the rest of your exhaust sytem under thcar is leak free and you don't have major holes in the firewall or floors. Like plugs being missing etc...