Dinan Performance Lowering Spring Set — G01 X3 / G02 X4

The 25% increase in spring stiffness front and rear is where the real performance story lives. Stiffer rates reduce rear squat under hard acceleration, limit front dive under braking, and cut body roll in corners — all of which tighten up steering response and build driver confidence at any speed. Two front linear rate springs and two rear dual rate springs are included, with the dual rate rear setup carefully calibrated to deliver both compliance over everyday bumps and control when the pace picks up.

Materials and construction are engineered to last. Each spring is CNC wound from high-tensile chrome silicon wire and shot-peened for stress relief, a process that removes surface tension and dramatically extends fatigue life. The preset design means these springs will not sag or settle over time — the ride height and handling characteristics you get on installation day are the same ones you'll have years down the road.

One critical installation note: Dinan strongly recommends pairing this spring set with their corresponding Ride Quality and Handling Kit, which includes matched bump stops and spring perches designed to maintain proper suspension travel. Installing the springs without the complementary kit will compromise ride quality and prevent you from achieving the advertised ride height. For anyone serious about getting the full Dinan suspension experience on their X3 or X4, these two products should be purchased and installed together as a complete system.