I only added electronics and that would be an AEM FIC-6 it can control your o2 sensors, fueling +/- 100%, timing retard and the MAF all for $365. I have used it on m113's, my m104 and a load of other engines so it will work on your m112.

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

http://img78.imageshack.us/img78/1051/log7smallay9.jpghttp://img66.imageshack.us/img66/740...s3smallox0.jpg