I have a way to be able use your factory GM serpentine air compressor as an on board air supply and want to check interest. FYI, the stock GM compressor has 4 pistons and is very powerful, many of you already have them, they are dirt cheap to buy in the yards, and the brackets are already available in the JY if you don't already run a serp setup. Not to mention you don't need to buy a 150.00 serpentine clutch pulley like with the york setups. My question is how complete or barebones would you want, and what would you be willing to pay? I would prefer selling the basic parts since I would be paying retail for the extra parts anyways, and then charging shipping. I have to setup tooling and fixtures for the parts needed to adapt a few things, but other needed parts like regulator, pressure switch, oil resivoir, etc you could source on your own at a local harbor freight or home depot.