The 6 Best Power Mods for E60 BMW 535i – N54 Tuning for Major Muscle NickAugust 31, 2016It's got that same beefy N54 twin turbo 6 as in the 335i/is and 135i/is, and like the N54 in those cars, it can make a TON of power with the right mods. If you...
