it's difficult to juge a feeling but i remember my partial bellypan really felt different the first tim i had it on, the car seemed much more quite and felt much smoother. the car does about 2 mpg's better than before although it's difficult to pinpoint the exact improvement.
another benefit is that the engine stays much cleaner.
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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