M 505 031SD is a vehicle-specific MOTON 2-Way Motorsport suspension kit for the applications listed below. A two-way adjustable monotube motorsport coilover kit with separate rebound and compression control, ride-height adjustment and external reservoirs. Springs and top mounts are included where applicable.
Vehicle applications
Match the chassis, model, model year and drivetrain to your car. Contact GSM Performance with the registration or VIN if any detail is uncertain.
| Make | Model | Chassis | Years | Drive | Notes |
|---|---|---|---|---|---|
| BMW | 316i | E46 | 1997–2006 | RWD | — |
| BMW | 318i | E46 | 1997–2006 | RWD | — |
| BMW | 318ti | E46 | 1997–2006 | RWD | — |
| BMW | 320i | E46 | 1997–2006 | RWD | — |
| BMW | 323Ci | E46 | 1997–2006 | RWD | — |
| BMW | 323i | E46 | 1997–2006 | RWD | — |
| BMW | 325Ci | E46 | 1997–2006 | RWD | — |
| BMW | 325i | E46 | 1997–2006 | RWD | — |
| BMW | 325ti | E46 | 1997–2006 | RWD | — |
| BMW | 328Ci | E46 | 1997–2006 | RWD | — |
| BMW | 328i | E46 | 1997–2006 | RWD | — |
| BMW | 330Ci | E46 | 1997–2006 | RWD | — |
| BMW | 330i | E46 | 1997–2006 | RWD | — |
| BMW | M3 | E46 | 2000–2006 | RWD | — |
Setup and installation
Spring rates and the supplied mounting parts are selected for the application. Have the kit installed and aligned by a suspension specialist, then check wheel, tyre and body clearance through the full steering and suspension travel. Follow the instructions supplied with the kit.
Ordering and lead time
This kit is made to order. The supplier currently advises an approximate four-week lead time, but this can change. Contact GSM Performance before booking installation if timing is critical.
Product image
The manufacturer image is a representative sample for this suspension family, not a photograph of this exact vehicle-specific part number. Component shapes, mounts, spring layout and supplied contents can differ by application.
Brand and product-family information: AST Suspension. Application and pricing source: supplier catalogue.




