Reviewed By David R (NORTH AURORA, IL) Reviewed for a 2011 Nissan Altima —2/3/2016 7:36 AM
Installation was a breeze for me, but I was a mechanic by trade for many years. The only thing that I didn't use was the Alan screws supplied for the mass air sensor, the OE screws had washers built on them " a flat and a lock not removable" the supplied screws didn't, and the alan wrench hole was not perfect, wrench would not fit all the way in! Just used the OE screws! Not sure about gas mileage, just installed. Can definitely tell there is a increase in horsepower, i love the new sound????