BC Racing ER-Series Coilovers for BMW E90 E91 E92 E93 (2005-2013), Part No ER-20-4001

For E90, E91, E92 and E93 chassis - especially N52, N54 and N55-powered models - these ER-Series coilovers deliver fast-road precision and track-day composure without the S55-level price tag.

• External reservoirs for consistent damping on extended track sessions or spirited B-road runs
• Fully adjustable compression and rebound - dial in for daily driver compliance, stage 1+ fast road, or full track day duty
• Ride height via lower mount - preserves full damper travel at any setting, unlike spring-platform designs
• Pillowball top mounts as standard - zero rubber deflection, sharper turn-in, no vague steering
• Camber-adjustable front and rear top mounts - essential for aggressive alignment on N54/N55 or track-day setups
• Black chromed steel bodies + anodised aluminium components - corrosion resistance tested on UK A-roads and winter car parks
• SAE9254 springs, nitrogen-pressurised dampers, and BC’s locking collar system - built for longevity, not just first impressions

Search terms this part actually answers: bc racing er e90, bc racing e92 coilovers, n54 track suspension, n55 fast road coilovers, e93 decat + lowered setup, e91 daily driver coilovers, bmw e90 stage 2 suspension.