The BC Racing ER Series Coilover System is the next evolution in your suspension tuning and vehicle setup needs. The ER Series offers 30-clicks of independently adjustable compression and rebound with remote reservoirs to increase oil capacity and help with faster heat dissipation.

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The Ultimate in driver feel for the track and spirited drivers, the DS series delivers that edge for novices and serious competitors alike.  If you prefer the instant response of a stiffer suspension but not necessarily the jarring impact of bumps at speed, the proprietary digressive piston design might be what you are looking for.  A common feature on high-end racing shocks, Digressive valving allows a low-speed roll resistance like adding a stiffer sway bar, but falls back into a linear fell for the bigger bumps and dips in the road or when pitched over in a corner.  DS deliver a great intersection between a single adjust and dual adjust ER series with a more performance feel without the tuning involved. 

General specs:

• Highly Customizable
• Mono-Tube Damper
• Linear Twin-Piston Design
• Height Adjustment Independent Of Spring Compression
• 30-Clicks Of Compression Adjustment Via The External Reservoirs
• 30-Clicks Of Rebound Adjustment From The Top Of The Damper
• Front And Rear Camber Plates Standard On All Applicable Kits
• Front And Rear Pillowball Mounts Standard When Camber Plates Do Not Apply
• Custom Spring Rates And Swift Spring Compatible
• Custom Valved To Match The Drivers Requested Spring Rates
• Swift Spring Upgrade Available On Most Applications
• 1-Year Warranty Against Manufacturers Defect
• Fully Rebuildable

Technical Specs:

• Digressive valve design for higher initial damping feel.
• 46mm Pistons over 53mm shock housings providing a large range of damping force capabilities.
  
• Special spring-steel valves outperform other stainless steels and offer prolonged valve life.
• Patented concave lower locking ring to prevent unseating
• Springs constructed of SAE9254 High Strength steel that is compression tested over 500,000 with less than 5% deformation.
• Pistons are high polished steel to lengthen oil seal life which means no leaking and longer seal life.
• High-pressure inner rod guide seals ensure a perfect fitment resulting in consistent fade-resistant damping and long seal life.
• 2-Step coating process utilizing nickel and chromium plating to prevent corrosion.
• Newly developed lubricant oil in all shock cartridges minimizes aeration/foaming and cavitation.

SWIFT Metric Coilover Springs are highly linear, with fewer winding springs that reduce unsprung weight and increase performance.