AC Schnitzer is the tuning division of BMW similar to Brabus for Mercedes-Benz and they are going to give us their take on the new BMW M3 and M4 models in due time. AC Schnitzer usually beefs up the output of the engine and adds a nice body-kit to go with all the interior and exterior upgrades.
The 3.0-liter twin-turbo straight-six engine is already rated at 425-hp and 406 lb-ft of torque so the AC Schnitzer M3 and M4 would be getting a healthier dose of 503-hp and 476 lb-ft of torque via an ECU tune making the AC Schnitzer version much stronger than the current 2016 BMW M4 GTS which is rated at 493-hp and 442 lb-ft of torque.
Thankfully, the AC Schnitzer M3 and M4 do feature a new exhaust kit that includes remote-controlled valves and a signature raspy sound to distinguish it from the current standard models. The AC models are also much lower than standard with two options to choose from; a spring kit to drop the front and rear by 1.0-inch and 0.5-inch respectively and a coilover suspension kit that drops a whopping 1.6-inch upfront and 1.2-inches in the rear.
The AC Schnitzer M3 and M4 also get downforce-improving aero bits that increase cornering speed beyond the standard models via carbon-fiber front splitter, a carbon front spoiler, carbon side wings, a carbon rear wing (Two height options) carbon mirrors, rear-roof spoiler and a carbon rear diffuser.
But of course, no AC Schnitzer is complete without special 19 or 21 inch rims that are either forged aluminum or normal aluminum depending on how deep your pockets are. Add to that the special treatment on the inside with a custom gear shifter, aluminum pedals, custom handbrake and a velour floor mats.
Source: AC Schnitzer