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The 7MGTE is just a single turbo and the JZ-GTE is a twin turbo engine made by toyota for the supra.
 

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7M-GTE: 3.0L, long stroke/smaller bore.

1JZ-GTE: 2.5L, twin-turbo (single turbo + VVT-i in newer models) with small cylinder bores and short strokes for fast revving.

The JZ family of motors was intended to take over 27 years worth of M motors. The 7M had head-gasket eating tendencies, and the 1JZ isn't available in North America. The M is the old predacessor.

Both engines are not made for the Supra exactly, as they come in several other cars. You've got 1JZ-GTE Mark II/Chaser/Cresta's, 1JZ powered Soarers (SC300), etc etc.
 
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