Product Details
BC Racing ER Series Coilovers for the 2000-2006 BMW 3 Series Coupe (E46) put race-grade adjustability in reach of the serious track-day driver, with independent compression and rebound tuning at every corner. Every kit is extensively tested on the 3 Series Coupe E46 chassis and refined until it balances ride quality with performance — the reason 3 Series Coupe coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
ER Series kits run a linear twin-piston design in a mono-tube body, with compression and rebound on separate external adjusters. That lets you fine-tune chassis balance corner by corner — stiffer front for turn-in, softer rear for exit grip, whatever the session calls for. Where BC Racing separates itself is tuning philosophy: every off-the-shelf spring rate and damper setup is chosen to stay comfortable on daily roads while still delivering real performance at the track. If you want something different, Swift Springs, custom rates, and custom valving are all options at checkout — BC will match the valving of the dampers to whatever springs you pick, something most brands don't offer outside their flagship race lineup.
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 Coupe coilovers arrive tuned for the E46 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 (top of damper)
- 30-level compression adjustment (external reservoir)
- 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-02-ER |
| Part Name | ER Series Coilovers |
| Vehicle | 2000-2006 BMW 3 Series Coupe RWD (E46) |
| Drivetrain | RWD |
| Chassis Code | E46 |
| Damping Adjustment | 2-Way (30 levels rebound 30 levels compression) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 6 kg/mm |
| Spring Rate - Rear | 10 kg/mm |
| Spring Size - Front | 62-180-6K |
| Spring Size - Rear | 62-140-10K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-140-X |
| Camber Plates - Front | Included |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | Divorced |
| Notes | The ER Series is not available in Extreme-Low configuration. |
Vehicle Fitment
- 2000 BMW 3 Series Coupe RWD (E46)
- 2001 BMW 3 Series Coupe RWD (E46)
- 2002 BMW 3 Series Coupe RWD (E46)
- 2003 BMW 3 Series Coupe RWD (E46)
- 2004 BMW 3 Series Coupe RWD (E46)
- 2005 BMW 3 Series Coupe RWD (E46)
- 2006 BMW 3 Series Coupe RWD (E46)