Did you have the full bellypan before or after the airdam?
I've had excellent results with my airdam, though without a bellypan.
I have since taken about 4" off my airdam (essentially making it a grille block) and added front and rear undertrays. I haven't had a full tank of gas through it since, but I'm interested to see the results.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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