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Z always means the engine is factory supercharged, but in the suffix, not in the engine family name.
TRD supercharged engines are always done afterward, so as the engine didn't come from the factory with a supercharger, it doesn't have the Z in its name.
Jeff
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2011 Lexus IS350 F-Sport 6MT with LSD
1986 Toyota Corolla GT-S Supercharged |