The BMW M4 now with big, wide curves thanks to Vorsteiner’s GTRS kit!
Even with the GTS kit unveiled back in SEMA for the BMW M3 and M4, Vorsteiner is still not done tinkering around the German machine. Focusing their effort on the M4, they had come up with a follow up to the GTS kit with some added goodies, and it is called the GTRS.