what year is your car and how many miles?

Fed warranty is 8 years or 80 k

MY cat when my car was 7 years and 70 k.. they replace it for $25 bucks.. at the chevy dealer

without my air i get like 19-21 city and i get like 30-32 hwy if im drving 65mph when i drive ilke 70 i get like 28 or something..

steve