Looking to amp up engine power. Between hauling a loaded cargo trailer, to building materials and snow plowing, I feel there is hidden potential in this little 5.3L. Currently installed is a KN cold air intake, Gibson shorty headers, magnaflow cat back dual 2.5" exhaust, and a superchips programmer. Also have a throttle body spacer that is not installed due to the fact it pushes the intake tube into the fan blades. Outside of buying a Duramax i cannot yet afford, I am looking for some more affordable options for any further upgrades.