{"product_id":"bilstein-36-301140-bmw-e70-b3-oe-replacement-rear-coil-spring","title":"BMW E70 X5 Rear Coil Spring Bilstein B3 36-301140 - Fast Road, Track Day, Daily Driver","description":"\u003cp\u003eBilstein B3 rear coil spring 36-301140 for E70 X5 (2006-2013). Not a soft OE replacement. Not a show-car poseur part. A properly engineered fast road or track day spring - stiff enough to sharpen rear axle response, stable under load, and durable enough for daily driver abuse.\u003c\/p\u003e\u003cp\u003eSearches this part actually matches: \u003cstrong\u003eE70 rear coil spring\u003c\/strong\u003e, \u003cstrong\u003eBilstein 36-301140\u003c\/strong\u003e, \u003cstrong\u003eX5 E70 fast road suspension\u003c\/strong\u003e, \u003cstrong\u003etrack day rear spring E70\u003c\/strong\u003e, \u003cstrong\u003estage 1 E70 upgrade\u003c\/strong\u003e, \u003cstrong\u003edaily driver X5 coilover prep\u003c\/strong\u003e.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHot-set chrome vanadium steel\u003c\/strong\u003e - no sag, no height loss, even after UK winters and track heat cycles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface-compressed \u0026amp; corrosion-protected\u003c\/strong\u003e - built for real use, not showroom shelves\u003c\/li\u003e\n\u003cli\u003eFits all E70 X5 variants: 30i, 35i, 40i, 50i, 30d, 35d, 40d, xDrive - no exceptions, no fitment notes needed\u003c\/li\u003e\n\u003cli\u003eDesigned as a matched set - always replace both rear springs for balanced handling and geometry\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBecause race car.\u003c\/p\u003e","brand":"Bilstein","offers":[{"title":"Default Title","offer_id":54381934346583,"sku":"BILSTEIN-36-301140","price":81.52,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1038\/4575\/7271\/files\/1poHSrfrPqrh4pwsU7Z76g0XU7pKpGakp_c224dd0e-7694-47c5-a295-7d24ddbd0ad4.jpg?v=1787137377","url":"https:\/\/cuzracecars.com\/products\/bilstein-36-301140-bmw-e70-b3-oe-replacement-rear-coil-spring","provider":"Cuz Race Cars","version":"1.0","type":"link"}