Öhlins Road & Track Coilovers for BMW 3-Series / M3 E46 BMS MI30S1
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Description
Öhlins Road & Track Coilover Suspension – BMW 3-Series / M3 (E46) BMS MI30S1
Part Number: BMS MI30S1 | Chassis Code: E46 | Fitment: BMW 3-Series (E46) 1998–2005 & BMW M3 (E46) 2000–2005
Over 40 years of motorsport engineering distilled into a street-ready coilover kit. The Öhlins Road & Track series delivers a genuine racing experience without sacrificing daily drivability — thanks to Öhlins' proprietary Dual Flow Valve (DFV) technology. Featuring separate compression and rebound damping adjustment, individual ride height adjustment, and an upside-down McPherson front strut, this kit unlocks the true potential of the E46 chassis. Springs are included. Corrosion-tested to ISO 9227 and backed by a 2-year limited warranty.
Technical Specifications
| Part Number | BMS MI30S1 |
| Technology | DFV — Dual Flow Valve |
| Damping Adjustment | Compression and rebound with single adjuster (front & rear) |
| Front Damper Type | McPherson strut — upside-down |
| Rear Damper Type | Conventional shock absorber |
| Front Spring Rate | 70 N/mm — included |
| Rear Spring Rate | 110 N/mm — included |
| Front Lowering Range | Approx. 15–35mm below standard |
| Rear Lowering Range | Approx. 5–30mm below standard |
| Top Mounts | Use with original top mounts (M3 top mounts required for non-M models) |
| Springs Included | Yes — front & rear springs included |
| Rebuildable | Yes — rebuildable for custom tuning |
| Corrosion Testing | ISO 9227 salt spray tested |
| Warranty | 2-year limited warranty |
| Homologation | TÜV certificate | Manufacturer confirmation (SUI) | GOCA (BE) |
General Features
- DFV technology (Dual Flow Valve) — Öhlins' proprietary damping system
- Individual height adjustment
- Rebuildable dampers for custom tuning
- Corrosion salt spray tested (ISO 9227)
- 2-year limited warranty
- Front & rear springs included
Front Features
- McPherson strut — upside-down design
- Compression and rebound damping with single adjuster
- Spring preload adjuster
- Separate ride height adjustment
- Approx. 15–35mm lower than standard (recommended setup)
- Spring rate: 70 N/mm — included
- Use with original top mounts (see note re. M3)
Rear Features
- Conventional shock absorber
- Compression and rebound damping with single adjuster
- Spring preload adjuster
- Separate ride height adjustment
- Approx. 5–30mm lower than standard (recommended setup)
- Spring rate: 110 N/mm — included
- Use with original top mounts
Purchased Parts Package Includes
- Coilover kit including springs and mounting parts
- C-Spanner (for spring preload adjustment)
- Owner's manual and mounting instructions
- Sticker set
What is DFV (Dual Flow Valve)?
DFV is Öhlins' proprietary damping technology that sets the Road & Track range apart from conventional coilovers. The dual flow valve provides consistent damping characteristics on both compression and rebound strokes — the damper fluid follows a consistent flow path in both directions. This means the wheel and tyre can rapidly return to the road surface after a bump, maximising grip and traction at all times.
Because DFV opens more quickly on minor road imperfections, ride comfort is surprisingly supple — more akin to an OEM strut than a typical coilover. Over undulating surfaces, the compliance of the R&T units allows the car to crest bumps and potholes while remaining stable and in control.
Why Öhlins Road & Track?
- ✅ Over 40 years of motorsport engineering heritage — trusted by factory race teams worldwide
- ✅ DFV technology — genuine race-car response with OEM-level daily comfort
- ✅ Upside-down McPherson front strut — reduced unsprung mass, sharper response
- ✅ Separate ride height and spring preload adjustment — front & rear
- ✅ Rebuildable, ISO 9227 corrosion-tested, 2-year limited warranty
Vehicle Fitment
| BMW 3-Series (E46) | 1998 to 2005 |
| BMW M3 (E46) | 2000 to 2005 |
Note: For non-M models, original BMW M3 top mounts are required.
If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.
Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.
Note
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.