Steve
Its a twin turbo set up, the bottom one you see is the low psi turbo, where the pipe comes up thats where the high psi turbo is I had taken it off when I took the pic. The h.p turbo is bolted to the exhaust manifold, the exhaust is then directed down to the low psi turbo then exits out the back of it. There is a waste gate on the high psi that meters the boost psi. The intake pipe from your air cleaner hooks to the low psi turbo then the air from the compressor housing goes up to high psi turbo inlet. the air comes out of the h.p turbo compressor housing then goes into the engine. There is 1 charge air cooler and 1 water air cooler. Ill try to take some pics of a complete set up so you can see it all together.