i just bought a turbosmart compgate 40 for my 18RGTE.... its nice and small, comes with flanges and V-band clamps, and its easy to adjust the air ports to various positions to work with whatever manifold design you have.
I've also heard good things about the new Tial gates with water cooling.
I'd stick with tial or turbosmart. Both are good.
As for what size, at a guess i would say 45mm is OK, but I would leave that answer to someone more experienced with 1JZ's to advise.
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