{"product_id":"bc-racing-er-series-coilovers-2021-2024-bmw-m4-competition-g82","title":"BC Racing ER Series Coilovers for 2021-2024 BMW M4 Competition AWD (G82)","description":"\u003cp\u003eBC Racing ER Series Coilovers for the 2021-2024 BMW M4 Competition (G82) 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 M4 Competition G82 chassis and refined until it balances ride quality with performance — the reason M4 Competition 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. The off-the-shelf setup from BC Racing is deliberately balanced — spring rates and valving chosen so the kit feels comfortable day-to-day without giving up performance when you push it. Drivers who want a different recipe can spec Swift Springs, custom spring rates, or fully custom valving at checkout; BC will tune the dampers to match, which is a depth of customization most brands only offer on their top-tier kits.\u003c\/p\u003e \u003cp\u003eSince 2004, BC Racing has grown into one of the most trusted names in aftermarket coilovers — not by racing to the bottom on price, but by pairing that price with real build quality, deep customization options, and a damper design any suspension shop can rebuild instead of replacing. These M4 Competition coilovers arrive tuned for the G82 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-109-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\u003e2021-2024 BMW M4 Competition AWD (G82)\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eDrivetrain\u003c\/td\u003e\n\u003ctd\u003eAWD\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eChassis Code\u003c\/td\u003e\n\u003ctd\u003eG82\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\u003e\u003c\/td\u003e\n\u003c\/tr\u003e \u003ctr\u003e\n\u003ctd\u003eSpring Rate - Rear\u003c\/td\u003e\n\u003ctd\u003e\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\u003e2021 BMW M4 Competition AWD (G82)\u003c\/li\u003e \u003cli\u003e2022 BMW M4 Competition AWD (G82)\u003c\/li\u003e \u003cli\u003e2023 BMW M4 Competition AWD (G82)\u003c\/li\u003e \u003cli\u003e2024 BMW M4 Competition AWD (G82)\u003c\/li\u003e \u003c\/ul\u003e","brand":"BC Racing","offers":[{"title":"Default Title","offer_id":63498133930353,"sku":"I-109-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-2021-2024-bmw-m4-competition-g82","provider":"BC Racing - Springrates.com","version":"1.0","type":"link"}