This is a 5.3 out of a 2002 Chevy Avalanche. It has the side mount Whipple 2300 supercharger kit. Comes with headers also. This is a complete, running set up taken out of a wrecked truck. It will come with the complete harness, fuel control computer and all accessories . Even auto meter boost and fuel pressure gauges. I contacted Whipple and got the installation instructions to understand the whole kit, that will come with it. Only serious buyers please. Don't waste my time. I would sell just the supercharger set up alone for $2,000.