In my bordom (and automotive A.D.D.) I planned out a turbo setup after scouring the info on this and the MB forums. Unfortunately, I do not have the money nor am I insane enough to void my 5 year bumper to bumper at this point. But for anybody who has considered it or would like to help fine tune the plan for anybody crazy enough to try it, read on...

-Custom cat-back exhaust setup that puts a Garrett turbo of appropriate size and trim (GT3571?) in place of the stock muffler. A heat sheild already exsists. Fabricate brakcets that position the turbine outlet to the rear of the car. You will see how all the other connections fall into place. To make it easy use a "3 bolt to V-band" adapter into a turbine housing with a V-band outlet. From there it's all fabricating tubing and supporting boost...

~40mm Wastegate (or go internal to make it easier)
RBracing Oil scavanger setup (best in the biz)
Coolant pump/scavanger? (for a water cooled turbo)
A large surface area/thin core air to air intercooler (or better)
Split Second FTC1 timing and MAF filter piggyback (FTC1-024 on similar MB setups)
Aeromotive Digital Fuel Management Unit to boost stock pump output
Larger injectors (SRT6 should prove large enough)

Hook up the FTC1 to react based on MAF, RPM, and Manifold Pressure (TPS might be good enough for a supercharged setup, but not for turbo). Put the big injectors in and filter the MAF voltage down to lower duty cycle to acheive acceptable A/F ratios when you're not under boost. Then tune the FTC1 to pull timing and multiply the MAF signal (resulting in higher injector duty cycle) and tune the Aeromotive DFMU to increase fuel pump voltage to supply the neccessary fuel pressure when under boost.

You're going to want some monitoring tools. Wideband A/F meter, Boost controller, laptop with a serial port and the "Split Second" software, fuel pressure gauge, etc.

It's certianly more crude that paying somebody to "tune" your OEM controller (although that will cost about the same if you even find someone to do it), but it's been done before on MB supercharger setups with great success.

^ Care to critique it?

Unforseen problems?
Additional equipment needed?
Cheaper alternatives (other than "buy an SRT6")?

Volunteers?