2014 BMW 435i xDrive N55, M Performance I, 19 inch wheels with the JB4 map 1 tune. Otherwise everything else is stock.
JB4 Map 1 is the most timid map to be used with 91 octane gas and no other modifications. The power gains are felt right away (after reaching the JB4 operating temperature) and the engine really wakes up. So far no issues, just grins and smiles every time I go WOT. Filmed at 3,000ft so I imagine the 0 to 60 times are even quicker at lower elevation.
