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 stock 4.4L TTV8. Now we’re talking. If you already own, or plan to own a 550i, this is where it’s at. DINAN won’t say it, but we’d guess the $2,600 Performance Tuner on its own is responsible for most of those gains, and is an even better value on its own, without the exhaust and mid-pipe."
Take a look at the full review here >> https://bit.ly/2Q5368d