No leaks that I can find, that was the first thing I checked replacing all of the gaskets, and going as far as wrapping the joints with that repair tape where the front/rear pipes connect (even though there wasn't any evidence of a leak).
Since the fumes weren't a problem until 60-65mph. I believe it's a simple matter of a vacuum being created and sucking the fumes from the engine compartment. The tailpipe exits just under the fender behind the left tire, which is probably fine at slower speeds, but when traveling faster a vacuum is created and draws the fumes back into the engine compartment... that is if there's no boot at the end of the tunnel which is how the vacuum is created.
At least that's my theory since plugging the tunnel solved the problem.
Scot
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