The HARDEST part about packaging the rear mount set up is finding a reliable pump to push the oil back to the motor after its gone through the turbo. You need to find a good electric pump to push the oil back to the pan. The key word there is "good." Not a lot of companies out there have shown to have reliable pump setups. Weldon is one though, however, they are not cheap. You also have to be aware that the pump can try to suck the seals out of the turbo if it isn't drawing from a vented catch can. So oil feed your turbo, then drains out the bottom into a catch can of some sort with a vent in it. Reason being is...the oil pump will want to draw oil than the turbo is actually putting out...so we let the oil collect in the bottom of a container (catch can) with an open (vented) top and then have the pump pull from there. If the container runs dry, the pump just sucks air from the atmosphere (vent at the top of the catch can) and doesn't try to pull the seals through the turbo. With me? Now you can also run a small 2-3 quart reservoir in the trunk and use the pump and make a standalone oil system solely for the turbo. This is easier to package in a truck b/c you have more ground clearance to help you.
If this were me and I wanted run a rear mount turbo, here is what I would do.
keep your long tubes, ditch the X,H,O,Alphabet-Pipe. Make a Y-pipe run it down the driver's side. Mount the turbo where the driver's side muffler was (floor of the car raises up there and has some clearance), run your cold side piping up the passenger side where the other exhaust pipe USED to run, the the fender over the tire and into the motor. Wrap exhaust in header wrap, hi temp paint, ceramic coat, aluminum foil, whatever...just wrap it. Keep the heat in there and off the coldside. Run and oil feed to the back of the car from the motor to the turbo and use the space left by the now non existant passenger muffler to package your oil return setup. Muffler? None...dump it off the turbo. Mount a wastegate close the turbo, run a boost reference right off the compressor to the bottom of the gate (this is simple turbo shit now at this point). Airfilter? slap a cone filter with an outerwear on it and stay out of puddles or if you can snake it over the axle and into the trunk, even better. If you could afford to sacrifice the trunk, I would cut out the spare tire well, ditch the stock tank, put a flat floor in there, mount a 12 gallon short, wide fuel cell in it, and free up a SHITload of real-estate behind the axle.
This is all easy to type out but executing is a different story...but if you're motivated, creative, have a pretty basic understanding of mechanics and electrical, and are handy with even a crappy little 110v MIG Welder, you could do this cheaply and (in my opnion) easy. And yes, while a front mount set up IS preferred...the fact of the matter is, its still boosted..."just add 1 more lb."
