Product Details
BC Racing ZX Series Coilovers for the 2000-2006 BMW 3 Series Convertible M3 (E46 M3) bring the same three-axis adjustability as the race-spec ZR Series with valving tuned for drivers who split time between street and track. Every kit is extensively tested on the 3 Series Convertible M3 chassis and refined until it balances ride quality with performance — the reason 3 Series Convertible M3 coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
ZX Series kits share the three-axis damper architecture of the race-spec ZR Series, tuned out of the box for drivers who want race-grade adjustability without the ride harshness on the commute home. BC Racing takes pride in choosing spring rates and damper valving that balance comfort and performance — you never end up with the oversprung, harsh-riding kit some brands ship as their only option. Drivers who want to deviate from the factory setup can order Swift Springs, custom spring rates, and custom valving at checkout; BC will re-valve the dampers to match whatever you specify, a level of customization most brands reserve for their top-tier race kits.
BC Racing has been manufacturing adjustable coilovers since 2004 and is one of the most popular coilover brands in the automotive tuning industry for a reason: competitive pricing, deep customization, proven reliability, and a fully rebuildable damper design that lasts years instead of seasons. These 3 Series Convertible M3 coilovers arrive tuned for the 3 Series Convertible M3 chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.
Features
- 30-level rebound adjustment
- 15-level low-speed compression adjustment
- 12-level high-speed compression adjustment
- Inverted mono-tube damper with linear twin-piston design
- Ride height adjustable independent of spring preload
- Upper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.
- Swift Spring and custom spring rate upgrades available at checkout
- Custom damper valving paired with custom spring rates on request
- Fully rebuildable — replacement parts available from BC for the life of the shock
- 2-year manufacturer warranty against defects
Specifications
| Part Number | I-121-ZX |
| Part Name | ZX Series Coilovers |
| Vehicle | 2000-2006 BMW 3 Series Convertible M3 RWD (E46 M3) |
| Drivetrain | RWD |
| Chassis Code | E46 M3 |
| Damping Adjustment | 3-Way (30 levels rebound 15 LSC 12 HSC) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 6 kg/mm |
| Spring Rate - Rear | 8 kg/mm |
| Spring Size - Front | 62-180-6K |
| Spring Size - Rear | 62-150-8K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-152-X |
| Camber Plates - Front | Included |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | True Coilover |
| Notes | The ZX Series is not available in Extreme-Low configuration. |
Vehicle Fitment
- 2000 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2001 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2002 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2003 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2004 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2005 BMW 3 Series Convertible M3 RWD (E46 M3)
- 2006 BMW 3 Series Convertible M3 RWD (E46 M3)