H&R 50421 Sport Lowering Springs for 2003-2008 BMW Z4 E85

Vehicle Fitment

• 2003-2008 BMW Z4 (E85, 2.5i / 3.0i / 3.0si / Z4 M Roadster & Coupe, RWD)

Features

• Sport lowering springs engineered for improved handling and stance
• Progressive spring rate design reduces body roll and enhances cornering control
• Lowers center of gravity for sharper steering response
• More aggressive visual stance with reduced wheel-to-fender gap
• Maintains balanced ride quality for daily driving comfort
• High-strength spring steel construction for durability
• Shot-peened and block-set to resist fatigue and sag
• Direct bolt-in fit - no cutting or special modification required

Specifications

• Brand: H&R
• Part Number: 50421
• Application: Sport lowering springs (front & rear)
• Approx. Front Lowering: ~1.5 inches
• Approx. Rear Lowering: ~1.25 inches
• Material: High-strength 54SiCr6 spring steel
• Finish: Protective corrosion-resistant coating
• Quantity: Set of 4 springs (2 front, 2 rear)

Included Components

• 2x Front Sport Lowering Springs
• 2x Rear Sport Lowering Springs

Product Description

The H&R 50421 Sport Lowering Springs are precision-engineered suspension upgrades designed for **2003-2008 BMW Z4 (E85)** models, including 2.5i, 3.0i, 3.0si, and Z4 M variants in both roadster and coupe body styles. These sport springs lower the vehicle's ride height by approximately **1.5 inches up front** and **1.25 inches in the rear**, bringing the center of gravity closer to the road for improved handling, reduced body roll, and more refined cornering response. The lowered stance also enhances visual appeal with a tighter wheel-to-fender fitment.

Constructed from high-strength 54SiCr6 spring steel and engineered with a progressive rate design, the 50421 springs balance enhanced performance with everyday ride comfort. They install as a direct bolt-in replacement for the factory springs with no cutting or special modifications required. A professional alignment after installation is recommended to optimize suspension geometry and tire wear. These sport springs are ideal for Z4 owners seeking enhanced handling dynamics and a sportier stance while maintaining drivability for daily use.