Quote:
Originally Posted by RobBeck
The turbos are the same part numbers. If they work on any N54 they will work the same on a 1M. There is no reason to treat it as there is some exclusitivity with the 1M in this regard. My $.02
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The 1M has different ecu software and the exhaust system might have less restriction than 135i. The slightly larger 1M intercooler might be another reason they want to test/tune a 1M.