not intirely sure, but i think the U was originally for something that was just starting to come in on motors, think possibly fuel injection. as almost all motors nowadays run fuel injection of some form, the U was dropped, and now most motors are known without it. there is an engine known as the 3sgelu, which the L, and possibly the U stand for emission control. the motor itself is identical (block, head, and all internals) but there is a slight difference in the manifold and possibly ecu. (thanks for that info L).
so yeah, in short, the motor is the same as a normal 7mgte.
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