B beastly22 New member Dec 28, 2010 #1 I have a 2000 grand am gt and i was wondering if i bought a cat back monza performance exhaust and a k&n cold air intake, how much horsepower will i gain, and also i get around 20-22 mpg would that stay somewhere around the same?
I have a 2000 grand am gt and i was wondering if i bought a cat back monza performance exhaust and a k&n cold air intake, how much horsepower will i gain, and also i get around 20-22 mpg would that stay somewhere around the same?
