XYZ Racing Drift Spec Coilovers — Maserati BITURBO SI φ52 welding (PCD: 4X98) 1986-1991

Weight transfer is everything on the Biturbo SI, a car that came from the factory with a nose-heavy front-mounted twin-turbo layout and rear-drive dynamics owners now use for something Maserati never designed it for: sustained slip angle. The XYZ Racing Drift Spec coilover exists for exactly that job. It is not a track-day compromise fitted to a drift car – it is built around the specific demands of holding a car sideways under load.

For the Biturbo SI’s φ52 welding-type strut, that means a kit engineered to keep the body settled through the transition into a slide and stable once you are there, rather than one tuned around minimising roll on a clean, grip-focused lap.

What this coilover does for your 1986-1991 Maserati Biturbo SI Φ52 Welding (pcd: 4×98)

Drop the ride height correctly on this kit and the change in geometry is immediately obvious in how the car initiates. A lower stance shifts the roll centre and shortens the distance the body needs to travel before weight is fully loaded onto the outside front tyre – the exact moment that decides whether a Biturbo SI holds an angle cleanly or snaps into oversteer you cannot catch. With proper bump stroke set, the rear end stays planted through weight transfer instead of skipping, which is what lets a driver hold a consistent angle through a corner rather than fighting constant correction. On a car with as much front-end mass as the Biturbo SI carries, that stability under lateral load is what turns a wild slide into a controllable one, and it is the difference between a drift that looks deliberate and one that looks like a save.

About the Drift Spec coilover

XYZ Racing’s Drift Spec platform is purpose-designed around competitive drifting rather than adapted from a road or circuit spec. The core engineering goal is body control during high-speed, high-angle cornering – keeping the chassis stable enough that a driver can hold a precise line and a controlled angle rather than react to unwanted weight shift. Ride height reduction is paired with a bump stroke calibrated specifically for this use, so lowering the car does not just change the look of the Biturbo SI, it changes how the suspension behaves the moment lateral load builds. The result, on XYZ’s own terms, is drift control brought to what they describe as an excellent condition – body stability held through the turn so the driver, not the chassis, decides the angle. For a platform like the Biturbo SI, φ52 welding construction on the strut means the kit is built to integrate with this specific chassis’s original strut mounting rather than a generic adapted fitment.

Fitment for the Maserati Biturbo SI Φ52 Welding (pcd: 4×98) (1986-1991)

This kit is built for the Maserati Biturbo SI, chassis code MS03, across the 1986 to 1991 production span, with a φ52 welding-type strut and 4×98 PCD. Confirm your car matches this strut type and PCD before ordering, as Biturbo variants were sold with more than one suspension configuration across this period.

What buyers also search for

• Maserati Biturbo SI coilovers built for drift rather than road or track use
• Suspension setup for controlling weight transfer on a nose-heavy Maserati Biturbo
• Adjustable ride height and bump stroke for the Biturbo SI drift build
• Coilover kit matched to Biturbo SI φ52 welding strut and 4×98 PCD
• Maserati Biturbo SI suspension for competitive drifting setups

Configure your Drift Spec coilovers for the Biturbo SI below and set the spec to match how you actually drive it.