I've used TurboXS MBC's in the past with good results. I always prefer a lower spring in the w/g and controlling boost via MBC or EBC instead (like most others).
I'm going with an EBC on this car, for the first time. I like the options and in-car control in spite of the higher price.
EDIT: No, you only need one boost controller for TT. The output just needs to tee off to connect to each w/g.
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