To start with I am no turbo expert, although someday I hope to be, but I personal don't like the idea of a rear mounted turbo for a couple reasons.
First off the oil issue, you would have to have engine oil go too the turbo and then drain into some tank and then be pumped back to the engine. That does not quite fit the KISS law to me.
And secondly, if I am not mistaken, my thermodynamic class tought me that the turbo is using thermal energy from the exhaut gases to transform into work to spin the compressor and make boost. As soon as the exhaust leaves the engine it starts to cool, by the rear of the car you could almost put our hand on the exhaust pipe, meaning there would be less energy then near the engine. I guess you could insulate the intire exhaust system to help?
I knwo there is companies out there making rear mount turbo setups and they are making proven Hp gains. If it were me and I was going to dump the $ into a turbo setup I would put it under the hood. Not only would the plumbing be easier, in theory it would be more efficent. Not to mention I would look a whole lot cooler!!!
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