H&R Sport Cup Kit – 2007–2011 BMW 328i Sedan (E90) | N51/N52 | 31054-1

The H&R Sport Cup Kit pairs H&R’s progressive-rate sport springs with upgraded OEM-style sport dampers — delivering approximately 2.0 inches of lowering and a significant improvement in handling response, cornering flatness, and steering feel over the factory E90 suspension. Engineered specifically for the 2007–2011 BMW 328i Sedan (E90) with N51 or N52 inline-six engine. A complete spring and damper package that transforms the E90’s already-capable chassis into a sharper, more engaging driver’s car — without sacrificing the street usability that makes the E90 328i such a compelling platform.

Sport Cup Kit vs. Coilover — What You’re Getting

The H&R Sport Cup Kit is not a coilover — it is a matched spring and damper package that uses OEM-style shock absorbers paired with H&R’s sport springs. This approach retains the OEM shock mounting geometry and serviceability of the E90’s factory suspension while delivering a meaningful performance upgrade. The OEM-style dampers are valved specifically for H&R’s sport spring rates, ensuring the spring and damper work together as a matched system rather than the mismatched combination that results from fitting sport springs to worn factory shocks. The result is a suspension upgrade that is more predictable, more comfortable, and more capable than sport springs alone — and simpler to install and service than a full coilover system.

Key Features

• ~2.0" Lowering: Approximately 2.0 inches of ride height reduction — aggressive lowering that meaningfully lowers the E90’s centre of gravity, reduces body roll, and delivers the performance stance the Sport Cup Kit is designed for. This is a performance-oriented lowering amount, not a mild comfort upgrade — verify tyre clearance and alignment capability at your intended ride height before installation
• Progressive Spring Rate Design: H&R’s progressive spring rate provides a compliant initial response for street driving comfort while stiffening progressively under higher cornering loads — delivering both everyday usability and the increased roll stiffness needed for performance driving. Superior to a linear spring rate for a street/track dual-use application
• Matched Sport Dampers: OEM-style sport dampers valved specifically for H&R’s sport spring rates — ensuring the spring and damper work together as a matched system. Fitting sport springs to unmatched or worn factory dampers results in unpredictable handling and accelerated damper wear; the Sport Cup Kit eliminates this by providing a complete, matched package
• E90 Sedan Specific: Engineered for the E90 sedan body style — the four-door 3 Series. Not the same fitment as the E91 Touring (wagon), E92 coupe, or E93 convertible, which use different suspension geometry. Confirm your specific body style before ordering
• N51/N52 Inline-Six Fitment: Designed for the naturally aspirated N51 and N52 inline-six engines fitted to the 328i — not the N54/N55 turbocharged engines used in the 335i, which have different suspension tuning requirements
• H&R German Engineering: H&R is a German suspension manufacturer with decades of OEM supplier and motorsport experience. The Sport Cup Kit carries H&R’s engineering standards and quality into a street performance application

Fitment

• BMW 328i E90 Sedan — N51 / N52 Inline-Six (2007–2011)

E90 sedan only — not compatible with E91 Touring, E92 coupe, or E93 convertible. Not compatible with N54/N55 turbocharged 335i applications. Verify your specific production date and equipment level — E90 suspension variants may differ by market and optional equipment. Professional installation and a four-wheel alignment are required after installation.

Specifications

• Brand: H&R
• Part Number: 31054-1
• Series: Sport Cup Kit
• Components: Progressive Sport Springs + OEM-Style Sport Dampers
• Lowering: ~2.0" (front and rear)
• Spring Design: Progressive Rate
• Weight: 85 lbs (complete kit)
• Application: BMW 328i E90 Sedan N51/N52 (2007–2011)

Installation Note: Professional installation by a shop experienced with E90 suspension is strongly recommended. A four-wheel alignment with camber, caster, and toe adjustment is required after installation — budget for this alongside the kit cost. At ~2.0" of lowering, verify front and rear tyre clearance before finalising installation. Check for any suspension travel limitations at your intended ride height.