I do remember reading about someone who dyno'ed and then did the TTC mod at the dyno and dyno'ed agian. It was a very long time ago and I forgot who it was but I remember the hp only being different by 1 or 2 hp and I don't remember which side it was in favor of.
TTC builds up midrange power quicker than sequential . The real reason to have it on a BPU 6 spd is that the kick from the #2 can cause compressor surge particulary with the higher then stock pressure we run and cause failure of number 2 TTC by avoiding the transition negatest he possiblity and is therefore better for tubo longevity.
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