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Re: Best add-ons or mods to boost mileage? 98, 5.7 Vortec
get a K&N filter it will help. Also open the exhaust up. Flowmaster or something like that. Let that baby breathe!
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Matthew Brough 
1997 Geo Prizm -- 301,000 miles
2000 Honda Accord -- 225,000 miles
2004 GMC Yukon XL -- 223,000 miles
1987 Jeep Comanche -- 116,000 miles
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