California-based European Auto Source teamed up with German powerhouse AC Schnitzer, and other aftermarket companies, to tune up a BMW M4. The project was dubbed ACS4 and features, among other performance parts, a series of aero upgrades from AC Schnitzer and BMW M Performance.

Starting life as a simple Austin Yellow M4, the car was equipped with AC Schnitzer’s carbon fiber front spoiler elements, F80-F82 front splitter, front side wings made of the same material as well as a rear diffuser and a racing rear wing. IND chipped in with prepainted front bumper reflectors while the BMW M Performance catalogue provided the side blades in gloss black, mirror caps, kidney grilles and sidemarkers.

C Schnitzer ACS4 build by European Auto Source-4

The car also received Sparco seats and the complete AC Schnitzer package made up of aluminum handbrake handle “Black Line”, aluminum pedal set, foot rest and black floor mats. The BMW GTS steering wheel and AWRON gauge add to the sportiness of this M4.

C Schnitzer ACS4 build by European Auto Source-15

Thanks to an ESS Stage II Turbo upgrade with a Stage II ECU flash along with Evolution Racewerks aluminum charge pipes and Eventuri carbon Kevlar intake system, the ACS4 M4 now delivers 600 horsepower. The Sparta Evolution TS260X Triton 6-Piston BBK, 380mm are there to help with the stopping power.

C Schnitzer ACS4 build by European Auto Source-16

The full upgrades list of this amazing aftermarket project can be seen below.

2015 BMW M4, Austin Yellow, DCT Transmission

ESS Stage II Turbo Upgrade w/ Stage II Flash Tuning
Evolution Racewerks Aluminum Charge Pipes
Eventuri Carbon Kevlar Intake System

AC Schnitzer Carbon Fiber Front Spoiler Elements
AC Schnitzer F80-F82 Front Splitter
AC Schnitzer Front Side Wings Carbon Fiber
AC Schnitzer Carbon Fiber Rear Diffuser
AC Schnitzer Racing Rear Wing Carbon Fiber
IND Prepainted Front Bumper Reflectors
BMW M-Performance Side Blades, Gloss Black
BMW M-Performance Carbon Fiber Mirror Caps
BMW Performance Kidney Grilles
BMW Performance Sidemarkers

Sparco SPX Carbon Fiber Seats, Matte Finish
AC Schnitzer Aluminium Handbrake Handle “Black Line”
AC Schnitzer Aluminum Pedal Set
AC Schnitzer Aluminum Foot Rest
AC Schnitzer Black Floor Mats
Awron DGA Digital Display Gauge
PedalHaus Black Anodized Billet Aluminum Shift Paddles
BMW GTS Steering Wheel

BavSound Stage I Speakers
BavSound Ghost Subs

Moton Clubsport Coilovers

Akrapovic Evolution Titanium Exhaust System, Carbon Tips
Evolution Racewerks Catless Downpipes

Sparta Evolution TS260X Triton 6-Piston BBK, 380mm
Sparta Evolution TS240X Triton 4-Piston BBK, 380mm


AC Schnitzer 9.0Jx20ET25 AC1 FORGED Bi-Color
265/30R-20 Pirelli P Zero Nero Tires

AC Schnitzer 10.0Jx20ET33 AC1 FORGED Bi-Color
295/30R-20 Pirelli P Zero Nero Tires