For those considering this setup, get it!!! It is amazing. I have written a review on them and its in suspension forum. Its labeled "The only Sonic Tuning S1 review you'll read"
2012 335i (f30) Alpine White, Dakota Black Leather, Sportline, Premium, Technology, HK, Gloss Black Vinyl roof, rails, lower rear bumper and trunklid spoiler, Black Mudflaps F&R, ER 4" catless dp, M Performance Suspension, Ace Alloy Convex Matte Black 20" (20x8.5 et35, 20x10 et40), Falken FK453 (245/35/20, 285/30/20)