By now, Brabus can rest on a well-earned reputation of boosting the power output of Mercedes-Benz vehicles, something that’s repeated here on the GLA-Class AMG. The pertinent figures: the PowerXtra CGI B45 tuning kit for the range-topping GLA 45 results in 400 hp and a peak 369 lb-ft of torque. Consequently, the all-wheel-drive crossover sprints from 0 to 100 km/h (62 mph) in just 4.4 seconds, ultimately reaching a top speed of 270 km/h (168 mph). Additional upgrades include a stainless-steel quad exhaust, twin-spoke sports wheels with sizes ranging from 18 to 21 inches, and a rear diffuser and Brabus front splitter. A series of underfloor LED lamps round out the details. Check out close-up looks below.