· The Following is The Line Up of "Off The Shelf" Garrett GT-R (R for  Ball Bearing) turbochargers

Turbo Unit	Turbine Wheel	Compressor Wheel	Flow Capacity
GT25R	53mm	54.4mm	240 HP
GT28R	53mm	60mm	290 HP
GT28RS	53.85mm	60mm	350 HP
GT2871R	53.85mm	71mm	400 HP
GT3071RWG	56.5mm	71mm	450 HP
GT3071R	60mm	71mm	450 HP
GT30R	60mm	76mm	500 HP
GT35/40R	68mm	82mm	600 HP
GT40R	77mm	88mm	700 HP
GT42R	82mm	94mm	850 HP
GT42RS	82mm	102mm	1000 HP