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I do not know of any T518Z that are flanged T3, to the best of my knowledge they are all T25 flanges for bolting onto SR20s and RB26s.

More speculation, a guy was telling me that the T518Z is basically a TD05-18G that has different housing so that it is a bolt on option for the SR and RB26. I dont know this for sure, but makes sense i suppose.

So a T518Z should make about the same power as a TD05-18G, which are available with T3 flanges for use on RB20/25s

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