Dinan adjustable arms are used throughout much of the suspension, although some of the factory arms remain. The rear swaybar end links are factory, while the front endlinks have been upgraded to feature spherical rod end units from Bimmerworld.
Factory rear subframe bushings have been replaced with an AKG Motorsport
Rear Subframe Bushing Set, made from their hardest 75D poly.
Body roll control was significantly improved after upgrading the hollow OE sway bars with a set of solid Eibach sway bars. Here you can see the extremely beefy front Eibach sway bar. The front bar is 28mm and the rear is
Stopping is important, too.
Up front, the 135i wears Wilwood AERO6 6-piston brakes, part of their brake upgrade kit for the E8X. Porterfield / Raybestos ST-47 pads clamp a two-piece Wilwood SRP drilled and slotted rotor and turn speed into heat and dust.
In the back, Wilwood 4-piston calipers are outfitted with Porterfield / Raybestos ST45 pads, similarly smushing a two-piece SRP rotor.
You might be wondering what kit Solo used here, and the answer is that they didn’t. Wilwood sent something that was close, and Solo modified it to make it work. The rotors are the same, front and rear, measuring 14” in diameter and requiring 18” wheels.