I'm twin turbocharging the M70... not finished it yet but have all the bits and am using a Motec M800.
I know a guy in the states who has an 850 that he fitted twin turbos to, with no other mods it did 540ft lb at the wheels... he didn't open the engine at all just bolted on the turbos added an intercooler and remapped the std ecu (piggyback I think).
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