I heard on the grapevine, Akrapovic is soon to develop a Ti system for the 135i...I wonder if they will be doing anything in conjunction with BMW or if it will be a straight(ish) swap...???
3.2l e46 had quads...dont see why they shouldnt have them on the 1 M? Makes it trickier to 'fake' a 1 M with a 123d