Eibach 4045.140 Pro-Kit Lowering Springs Progressive Rate Performance

The Eibach Pro-Kit (PN: 4045.140) is an industry-leading spring system engineered for enthusiasts who demand improved performance and aggressive stance from their daily-driven street vehicles. Designed and validated by Eibach's suspension engineers and professional performance drivers, the Pro-Kit delivers a measurable upgrade in handling dynamics without sacrificing everyday ride quality.

By lowering the vehicle's center of gravity 1.0" to 1.5" (exact amount varies by application), the Pro-Kit significantly reduces body roll in corners, nose-dive under braking, and rear squat during acceleration. The result is a more planted, confident feel behind the wheel — whether you're navigating a canyon road or commuting on the highway.

Eibach's proprietary progressive spring rate design is the key to the Pro-Kit's balance: softer initial spring action absorbs everyday road imperfections comfortably, while progressively increasing stiffness resists body motion under harder driving conditions. This makes the Pro-Kit an ideal upgrade over factory springs for street use.

Key Features:

• Improved Handling: Reduces body roll, brake dive, and acceleration squat
• Aggressive Lowered Stance: Lowers vehicle approximately 1.0" – 1.5" (application-specific)
• Progressive Spring Design: Delivers excellent ride quality without harsh stiffness
• Better Aerodynamic Efficiency: Reduced ride height can improve fuel economy
• Pairs Well with Eibach Plus-1 or Plus-2 Wheel & Tire Packages for a complete performance upgrade
• Million-Mile Warranty: Backed by Eibach's industry-leading lifetime guarantee
• Direct OEM-style fitment — no cutting, no modifications required

Every Eibach Pro-Kit spring set is cold-wound from high tensile steel and shot-peened for long-term durability. With Eibach's million-mile warranty and decades of motorsport heritage, the 4045.140 Pro-Kit is a proven, trusted choice for performance-minded drivers.