Last year Michael from Indiana stopped in for our Blue Belt Performance Package. This year he brought his M6 car back for an upgrade to Purple Belt. The result was a very smooth powerband peaking at 608 whp and 610 whp, running E49 fuel, and still using the factory airbox. We plan to see Michael again next year when he steps up to Brown Belt and joins the 700 whp club. 
Michael
from Indiana