The FG XR6-T turbo is not a smaller turbo. It is just a smaller compressor wheel.   For me I personally think if they had addressed the wastegate issues a bit better there are better turbo choices. Even at the same factory power levels spool can be greatly increased.   Here is the specs on the FG XR6-T T04S/GT35R hybrid Turbo. (500hp turbo) Compressor cover: T04E .50 A/R. Compressor wheel: Old school T04S/T04B. Inducer 53mm, Major 76mm. 7 bladed wheel. Tur