{"product_id":"bc-racing-er-series-coilovers-2000-2006-bmw-3-series-convertible-m3-e46-m3","title":"BC Racing ER Series Coilovers for 2000-2006 BMW 3 Series Convertible M3 RWD (E46 M3)","description":"\u003cp\u003eBC Racing ER Series Coilovers for the 2000-2006 BMW 3 Series Convertible M3 (E46 M3) put race-grade adjustability in reach of the serious track-day driver, with independent compression and rebound tuning at every corner. Every kit is extensively tested on the 3 Series Convertible M3 chassis and refined until it balances ride quality with performance — the reason 3 Series Convertible M3 coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.\u003c\/p\u003e \u003cp\u003eER Series kits run a linear twin-piston design in a mono-tube body, with compression and rebound on separate external adjusters. That lets you fine-tune chassis balance corner by corner — stiffer front for turn-in, softer rear for exit grip, whatever the session calls for. Where BC Racing separates itself is tuning philosophy: every off-the-shelf spring rate and damper setup is chosen to stay comfortable on daily roads while still delivering real performance at the track. If you want something different, Swift Springs, custom rates, and custom valving are all options at checkout — BC will match the valving of the dampers to whatever springs you pick, something most brands don't offer outside their flagship race lineup.\u003c\/p\u003e \u003cp\u003eBC Racing has been manufacturing adjustable coilovers since 2004 and is one of the most popular coilover brands in the automotive tuning industry for a reason: competitive pricing, deep customization, proven reliability, and a fully rebuildable damper design that lasts years instead of seasons. These 3 Series Convertible M3 coilovers arrive tuned for the 3 Series Convertible M3 chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.\u003c\/p\u003e \u003ch3\u003eFeatures\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e30-level rebound adjustment (top of damper)\u003c\/li\u003e \u003cli\u003e30-level compression adjustment (external reservoir)\u003c\/li\u003e \u003cli\u003eMono-tube damper with linear twin-piston design\u003c\/li\u003e \u003cli\u003eRide height adjustable independent of spring preload\u003c\/li\u003e \u003cli\u003eUpper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.\u003c\/li\u003e \u003cli\u003eSwift Spring and custom spring rate upgrades available at checkout\u003c\/li\u003e \u003cli\u003eCustom damper valving paired with custom spring rates on request\u003c\/li\u003e \u003cli\u003eFully rebuildable — replacement parts available from BC for the life of the shock\u003c\/li\u003e \u003cli\u003e2-year manufacturer warranty against defects\u003c\/li\u003e \u003c\/ul\u003e \u003ch5\u003eSpecifications\u003c\/h5\u003e \u003ctable class=\"table table-striped table-primary\"\u003e \u003ctbody\u003e \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eI-121-ER\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003ePart Name\u003c\/td\u003e\n\u003ctd\u003eER Series Coilovers\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eVehicle\u003c\/td\u003e\n\u003ctd\u003e2000-2006 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eDrivetrain\u003c\/td\u003e\n\u003ctd\u003eRWD\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eChassis Code\u003c\/td\u003e\n\u003ctd\u003eE46 M3\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eDamping Adjustment\u003c\/td\u003e\n\u003ctd\u003e2-Way (30 levels rebound 30 levels compression)\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eRide-Height Adjustable\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSpring Rate - Front\u003c\/td\u003e\n\u003ctd\u003e6 kg\/mm\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSpring Rate - Rear\u003c\/td\u003e\n\u003ctd\u003e8 kg\/mm\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSpring Size - Front\u003c\/td\u003e\n\u003ctd\u003e62-180-6K\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSpring Size - Rear\u003c\/td\u003e\n\u003ctd\u003e62-150-8K\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSwift Springs - Front\u003c\/td\u003e\n\u003ctd\u003e62-178-X\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSwift Springs - Rear\u003c\/td\u003e\n\u003ctd\u003e62-152-X\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eCamber Plates - Front\u003c\/td\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eCamber Plates - Rear\u003c\/td\u003e\n\u003ctd\u003eNot Applicable\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSuspension Design - Front\u003c\/td\u003e\n\u003ctd\u003eTrue Coilover\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSuspension Design - Rear\u003c\/td\u003e\n\u003ctd\u003eTrue Coilover\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eNotes\u003c\/td\u003e\n\u003ctd\u003eThe ER Series is not available in Extreme-Low configuration.\u003c\/td\u003e\n\u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch5\u003eVehicle Fitment\u003c\/h5\u003e \u003cul\u003e \u003cli\u003e2000 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2001 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2002 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2003 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2004 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2005 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003cli\u003e2006 BMW 3 Series Convertible M3 RWD (E46 M3)\u003c\/li\u003e \u003c\/ul\u003e","brand":"BC Racing","offers":[{"title":"Default Title","offer_id":63498149658993,"sku":"I-121-ER","price":1935.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2534\/9336\/files\/bc-racing-er-series-coilovers-2014-2015-chevrolet-camaro-q-10-er-41091479044338.jpg?v=1740535226","url":"https:\/\/bc.springrates.com\/products\/bc-racing-er-series-coilovers-2000-2006-bmw-3-series-convertible-m3-e46-m3","provider":"BC Racing - Springrates.com","version":"1.0","type":"link"}