Quote:
Originally Posted by Fishee
1M = factory tuned version of the N54, and i believe piston ring and cooling system changes from the 300hp version of the N54.
135is = N55.
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You can also freshen up any older N54 as I have, with the BMW Performance Power Kit 2. This adds the cooling system upgrades of the 135is, and comes with a code to flash the computer for a slight bump in power, but more importantly, a better torque curve and improved engine response feel.
The kit is also available for N55 engines.
Cooling enhancements include:
-Higher output radiator fan and associated electrical upgrades
-Auxiliary radiator and tubing for the driverside front corner