Just finding this one late. I agree the sequential twins on the MKIV Supra were a bit of a complexity nightmare but I would take a good parallel twin turbo setup over a big single any day of the week. In fact that's exactly what I did on my Supra, a Blitz twin turbo setup with two K26 hybrid turbos (GT ball-bearing cores). The increased spool up from the reduced rotational inertia is MORE than worth it... and a usable 600 wheel hp is tons. Pulls like a rocket ship right through the rev range.