roto-master turbo

[Doward]

Greddy uses Mitsubishi turbos, IIRC.

 

[MDCmotorsports]

ITS - uses custom castings & mainly garrett parts

Greddy - Mitsubishi

HKS - Garrett

Apexi - IHI

Sound Performance = Precision Turbo - Uses custom casting and mainly garrett parts

Turbonetics - Again, custom castings and mainly garrett parts