The W58 is only good for up around 400ish HP. An R154 is a direct bolt-up for the 7M's (standard manual transmission on 7MGTE MKIII Supra's), and the internals can hold up to TONS more power than the W58 (I don't know exactly how much power though). Just make sure that if you get a R154 you get it with a 7M bell housing, as the tranny was paired with a few different engines.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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