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sequential twin turbo is better I think as one spools up while the othe is kicking it. That way you have continuous momentum build up vs. plateau.
bi = twin are the same.
n54 is twin turbo
n55 is twin scroll single turbo
n54 is more tunable from what i heard, but i could be wrong. the last time my sister had Supra Turbo - we blew the turbo by running it too hot. :-(
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