{"product_id":"h-r-sport-spring-kit-bmw-335xi-e90","title":"H\u0026R Sport Spring Kit – BMW 335xi (E90, N52\/N54\/N55)","description":"\u003cstyle\u003e.sl-desc h2{font-size:1.15em;letter-spacing:.06em;text-transform:uppercase;border-bottom:2px solid #111;padding-bottom:6px;margin:1.6em 0 .7em}.sl-desc h3{font-size:1em;margin:1.2em 0 .4em}.sl-desc ul{margin:0 0 1em 1.2em}.sl-desc li{margin:.25em 0}.va-table{width:100%;border-collapse:collapse;margin:.5em 0 1em;font-size:.95em}.va-table th{text-align:left;padding:10px 8px;border-bottom:2px solid #333;white-space:nowrap}.va-table td{padding:8px;border-bottom:1px solid #e5e5e5;vertical-align:top}.sl-note{font-size:.9em;color:#555;margin:.4em 0 1em}\u003c\/style\u003e\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eH\u0026amp;R Sport Springs for the BMW E90 xDrive sedan are H\u0026amp;R's xDrive-specific spring rate for the all-wheel-drive 3 Series — a different part number from the rear-wheel-drive 335i kit because the extra front-axle hardware changes the corner weight the spring has to control. Replacing the factory coils lowers the car's center of gravity and reduces body roll for sharper handling and a more planted stance, without giving up the all-weather traction that makes an xDrive car worth owning.\u003c\/p\u003e\n\u003cp\u003eThe progressive spring rate is increased roughly 10–20% over stock, so the ride stays comfortable day to day and firms up under load. H\u0026amp;R's own fitment chart covers the 325xi, 328xi and 330xi (N52-powered) and the 335xi (N54, then N55 from the final production year).\u003c\/p\u003e\n\u003cp\u003eH\u0026amp;R builds every spring in-house from 54SiCr6 alloy spring steel and shot-peens it to increase service life by more than 200%, so the set resists sag and settling. Each spring is 100% tested before it leaves H\u0026amp;R's ISO 9001-certified plant in Germany, and the range carries TÜV approval.\u003c\/p\u003e\n\u003ch2\u003eSPECS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003exDrive-specific spring rate — not interchangeable with H\u0026amp;R's rear-wheel-drive E90 335i kit\u003c\/li\u003e\n\u003cli\u003eProgressive spring rates, increased approximately 10–20% over stock\u003c\/li\u003e\n\u003cli\u003eSpring material: 54SiCr6 alloy spring steel, cold-wound\u003c\/li\u003e\n\u003cli\u003eShot-peened to increase service life by more than 200%\u003c\/li\u003e\n\u003cli\u003eWill not settle or sag in service\u003c\/li\u003e\n\u003cli\u003eEvery spring 100% tested before leaving H\u0026amp;R's ISO 9001-certified production facility in Germany\u003c\/li\u003e\n\u003cli\u003eQuality certification: TÜV and ISO 9001\u003c\/li\u003e\n\u003cli\u003eWarranty: H\u0026amp;R covers springs for the duration of the original purchaser's ownership of the vehicle the springs are installed on\u003c\/li\u003e\n\u003cli\u003eNot for E91 Touring (wagon) models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePARTS INCLUDED\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eComplete H\u0026amp;R spring set (4 springs) as supplied by H\u0026amp;R Special Springs.\u003c\/li\u003e\n\u003cli\u003eSee the fitting instructions supplied in the box for the full bill of materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTECH RESOURCES\u003c\/h2\u003e\n\u003ch3\u003eAdditional Parts Required\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm xDrive drivetrain before ordering.\u003c\/strong\u003e This part number is xDrive-specific. The rear-wheel-drive E90 335i uses a different H\u0026amp;R kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring compressor.\u003c\/strong\u003e A spring-only kit requires the struts to be disassembled, which needs a proper coil-spring compressor. Installer-supplied.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-wheel alignment.\u003c\/strong\u003e H\u0026amp;R requires the alignment to be checked and reset any time ride height is changed. Budget for this before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional installation.\u003c\/strong\u003e H\u0026amp;R states its springs and suspensions should be installed by professional suspension mechanics only. Improper installation voids the H\u0026amp;R warranty.\u003c\/li\u003e\n\u003cli\u003eOptional: matched sport-valved dampers, since a lowered car holds up better on a damper valved for the shorter spring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/hr-springs-technical-installation-information.pdf?v=1787168924\" target=\"_blank\" rel=\"noopener\"\u003eH\u0026amp;R Technical Information \u0026amp; Installation Guide (PDF)\u003c\/a\u003e — spring identification and markings, dead and tender coils, ride-height measurement, bump-stop trim chart by part number, and alignment requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/hr-springs-warranty-and-claims.pdf?v=1787169177\" target=\"_blank\" rel=\"noopener\"\u003eH\u0026amp;R Warranties \u0026amp; Claims (PDF)\u003c\/a\u003e — official H\u0026amp;R warranty terms, coverage periods and claim procedure.\u003c\/li\u003e\n\u003cli\u003eVehicle-specific fitting instructions are supplied in the box with the spring set. H\u0026amp;R does not publish a separate per-application installation PDF for this part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis is the xDrive (all-wheel-drive) kit only — sedan body style. The rear-wheel-drive E90\/E92 335i and the E92\/E91 xDrive coupe\/wagon variants use different H\u0026amp;R part numbers (50490-4, 50494-2), not this one.\u003c\/li\u003e\n\u003cli\u003eVendor listings disagree on the closing model year for the 328xi and 335xi — some retailer catalogs extend coverage through model year 2012, others stop at 2008. Speed Logic uses the conservative reading tied to BMW's own E90 xDrive sedan production run (through MY2011, the last year before the F30 replaced the E90 sedan) and H\u0026amp;R's own note that this kit covers both the N54 and N55-powered 335xi, which places the N55 cars in the final MY2011 model year. Confirm exact fitment with Speed Logic before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePART NUMBER\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003e50494\u003c\/strong\u003e — H\u0026amp;R Sport Spring set, BMW E90 xDrive Sedan\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eVEHICLE APPLICATIONS\u003c\/h2\u003e\n\u003ctable class=\"va-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e325i xDrive\u003c\/td\u003e\n\u003ctd\u003eE90\u003c\/td\u003e\n\u003ctd\u003eN52 3.0L I6\u003c\/td\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e330i xDrive\u003c\/td\u003e\n\u003ctd\u003eE90\u003c\/td\u003e\n\u003ctd\u003eN52 3.0L I6\u003c\/td\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e328i xDrive\u003c\/td\u003e\n\u003ctd\u003eE90\u003c\/td\u003e\n\u003ctd\u003eN52 3.0L I6\u003c\/td\u003e\n\u003ctd\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e335i xDrive\u003c\/td\u003e\n\u003ctd\u003eE90\u003c\/td\u003e\n\u003ctd\u003eN54 3.0L Twin-Turbo I6 \/ N55 3.0L Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"H\u0026R Springs","offers":[{"title":"Default Title","offer_id":52599828676888,"sku":"50494","price":373.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/SportSprings_aae7adaf-015f-4a55-9e21-1b2daf2a1374.jpg?v=1788307018","url":"https:\/\/speedlogicauto.com\/products\/h-r-sport-spring-kit-bmw-335xi-e90","provider":"SPEED LOGIC","version":"1.0","type":"link"}