Car manufacturers and their in-house tuning divisions
Toyota - TRD(toyota racing development)
Honda - Mugen
Mitsubishi - Ralliart
Nissan - Nismo
Mazda - Mazdaspeed
Subaru - STI(subara tecnica international)
BMW - M(motorsport)
Merc - AMG(aufrecht melcher groBaspach)
many many more, pls add