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Re: Header?
if it is a quality header it will not, it may even increace gas mileage a hair(not including the lead foot factor which tends to increase after installing a header)
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Daily driver: 1995 Buick Regal Custom 3.8L 4T60-E 150K miles
Gone: 1994 Saturn SL2 1.9L MP3 168,666 miles
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