BC Racing HM Series Coilover System (2005 - 2007 Subaru Impreza STI - GDE / GDF) - F-03-HM
Hybrid Inverted Coilover Technology for the 2005 - 2007 STI
Take your 2005 - 2007 Subaru Impreza STI (GDE / GDF) to the next level with the BC Racing HM Series Coilover System - a premium suspension engineered by combining the strongest characteristics of the RM and ER Series. The HM Series uses fully inverted mono-tube dampers for added rigidity and reduced unsprung weight, while integrating the independent compression and rebound adjustments of the ER Series for unmatched tuning flexibility. Designed specifically for McPherson-strut Subarus that see heavy track use, the HM Series brings superior heat control, increased oil capacity through external reservoirs, and Swift Springs included as standard - making it one of the most capable coilover options for the GD-chassis STI.
Performance Highlights
- Inverted mono-tube damper design increases strength, reduces flex, and lowers unsprung weight.
- Independent 30-way compression and rebound tuning offers pro-level adjustability.
- External reservoirs provide expanded oil capacity and improved thermal management.
- Steel-braided reservoir lines ensure reliability and consistent fluid transfer.
- Swift Springs standard for better linearity, less fatigue, and superior response.
- Independent height adjustment preserves ride quality and full damper stroke.
- Front and rear camber plates included on all applicable kits for precise alignment control.
- Pillowball mounts used when camber plates do not apply for sharper feedback.
- Custom valving available for matching personalized spring rate requests.
- Fully rebuildable and backed by a 2-year manufacturer warranty.
Quick Specs
- Brand: BC Racing
- Series: HM Series
- Part Number: F-03-HM
- Vehicle Fitment: 2005 - 2007 Subaru Impreza STI (GDE / GDF)
- Damper Design: Fully inverted mono-tube with external reservoirs
- Compression Adjustment: 30-way via external reservoir
- Rebound Adjustment: 30-way via bottom of damper
- Height Adjustment: Independent of spring preload
- Default Spring Rates: Front 6kg/mm | Rear 4kg/mm
- Springs Included: Swift Springs (standard)
- Camber Plates: Front and rear included where applicable
- Mount Type: Pillowball mounts when camber plates do not apply
- Warranty: 2 Years (Manufacturer Defect)
- Rebuildable: Yes
Why Choose BC Racing HM Series Coilovers?
The HM Series stands out as an exceptional coilover choice for the GD-chassis STI due to its combination of inverted damper strength and independent damping adjustability. With upgraded Swift Springs included and external reservoirs providing superior heat management, this system is ideal for track-heavy builds, autocross drivers, and performance-focused daily owners. If you want improved rigidity, increased feedback, and pro-level suspension control, the HM Series delivers exactly that.
FAQs
How does the HM Series compare to the ER Series?
The HM Series offers the same independent damping control as the ER Series but uses an inverted mono-tube design, providing more rigidity and less unsprung weight - ideal for McPherson-strut Subarus.
Are Swift Springs included with the HM Series?
Yes. Swift Springs come standard on all HM Series coilovers, offering better performance and reduced spring fatigue.
Is the HM Series suitable for daily use?
Yes. Despite being track oriented, the wide damping adjustability allows the HM Series to be softened for comfortable street driving.
Are custom valving options available?
Yes. BC Racing can custom valve HM Series coilovers to match your preferred spring rates or driving style.
Fitment
- 2005 Subaru Impreza STI (GDE / GDF)
- 2006 Subaru Impreza STI (GDE / GDF)
- 2007 Subaru Impreza STI (GDE / GDF)
Why Buy from Beefcake Racing?
Beefcake Racing is an authorized BC Racing dealer, providing expert suspension support, fast shipping, and competitive pricing. Whether your STI is built for the track, the street, or a mix of both, our team will help you select the ideal HM Series setup for your driving goals. Contact us any time at sales@beefcakeracing.com or call 1-855-827-7223. Beefcake Racing - Performance Starts Here.
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