Wisefab Rear Suspension Drop Knuckle Kit, BMW E9x M3 (WF901M)

M3 version of Wisefab's E9x rear suspension kit. Link lengths differ between M and non-M cars, so this kit is specific to the M3. It corrects the rear kinematics once the car is lowered and adds trackside adjustment for camber, bump steer and anti-squat.

Fits

• BMW M3 (E90): E9x M3 per Wisefab
• BMW M3 (E92): E9x M3 per Wisefab
• BMW M3 (E93): Covered by Wisefab's 'E9x M3' name; not separately confirmed

Before you order

• Brakes: only M brakes or 336 mm (or larger) discs fit. Smaller brakes will not clear.
• Wheel bearing must be the 45x85x41 size.
• Needs lowering springs or coilovers. Minimum wheel size 17 in. Hub-to-hub track stays the same as factory because it is set by the halfshaft length.
• The original ABS wheel speed sensor can be reused; there is room for a larger CV joint.

Highlights

• Revised kinematics for a lowered car rather than just a dropped knuckle: higher roll centre, revised camber gain, anti-squat and bump steer
• Straight tubular top links: camber is set by changing link length
• Bump steer adjustable by moving the rod end in a slot
• Anti-squat adjustable in under 10 minutes at the track via the top forward link height (lower for more, higher for less)
• High-strength steel throughout; straight tubular or boxed links. Rod ends and spherical bearings throughout, no rubber bushings.
• M-style shocks fit inside the arm; brake mounts suit the 350 mm M brake or the 336 mm big-brake setup

In the kit

• Pre-set suspension links
• Uprights with hardware
• Subframe bushings with spherical bearings
• Installation guide