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The legendary Matt Farah drove our 2018 DINAN S1 M550i xDrive recently, here is a little of what he had to say. "Fortunately, as far as value goes, it gets better. DINAN’s S1 power kit, which features an ECU tune, black-coated stainless steel exhaust with “Quad-Fours,” four, 4” exhaust tips, and a mid-pipe goes for $5,649 and returns an estimated 606 horsepower and 635 lb/ft at the crankshaft, gains of 150 HP and 155 lb.ft over the s …