The Driving Sports team braves a torrential downpour to test how a modified 2009 BMW 135i stacks up against a brand new 2011 model. Can the N55 twin-scroll single turbo outperform a N54 twin turbo?

Cobb recently released the Accessport for the N54 engines. With a push of a button, you will gain 75hp and 100lbs of torque without any modification which is staggering.