VT2-575 actually comes with 1 size smaller pulley. Which is why the 575 runs more boost than the 550. Boost and tune is changed to accomplish.
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00 Jet Black 323i 5MT - Fuel Saver
02 Carbon Black M3 6MT - Fun Car
456whp/312wtq @ 8psi, No #'s yet at 9psi
4.10 / Headers / ESS VT2-550+