| Series | HM-Series |
| Type | HM |
| Vehicle | BMW 3-Series E46 Convertible 98-06 |
| Fitment Notes | RWD |
| Spring Rates (F/R) | 5.5/8kg/mm |
| Front Coilover | HA: Aluminium front top mounts with rubber centres. HH: Aluminium camber adjustable pillowball top mounts (where available) |
| Rear Coilover | HA: Aluminium rear top mounts with rubber centres, or no rear top mounts. HH: Pillowball only on the rear, or no top mounts |
| Damping Adjustment | 2-way adjustable - 30 levels of separate rebound and compression adjustment |
| Camber Adjustment | Available: front camber adjustment, front camber/castor plate |
| Kit Weight | 24kg |
| BC Part Code | I-90-HM |
| BC Part Number | 71594 |
BC Racing's HM Coilover system offers the same great benefits of the RM Series with the addition of 2 way damping adjustment. Each HM Coilover system features inverted mono-tube dampers with independently adjustable compression and rebound. The inverted damper design moves vital damper fluid away from detrimental heat sources to avoid overheating which can cause damper fade under extreme track use. The inverted damper also allows for decreased unsprung weight by moving the majority of the coilover mass up to the chassis improving ride quality, wheel control and steering feel. With the combination of inverted mono-tube dampers and external reservoirs the HM Series is suited for the most demanding users on the track.
The lower spring platforms are adjustable, allowing the car to be corner weighted for perfect balance and maximum tyre efficiency. The damper units are black chromed steel for superb durability even through the darkest of European winters, while aluminium components are anodised and steel lower mounts go through an electrophoretic deposition process followed by powder coating for outstanding corrosion resistance.
