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The TO4E 50, 57, and 60 trim all spool about the same and make similar power, but the 50 trim does it more efficiently. The other two are just a waste in my opinion. The turbo your tuner has, sounds like a GT35R or a similar variant.
Divided housings are nothing new, although I haven't seen very many divided .63 T3 housings. ATP turbo makes a divided .78 T3 housing though.
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-Luke
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