Hi there, you will have to ensure that the full exhaust system is sealed from the manifold to the tail pipe, any leak will be drawn into the cabin, chances are that even at higher speeds this is happening only at a lesser level and this is just as dangerous, the car will need to be put up on a hoist to fully inspect the exhaust, do this ASAP.
Mark (mhpautos)
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Tuesday, December 15th, 2009 AT 3:59 PM