SF Racing Air Struts for the 2014-2015 BMW 4 Series Gran Coupe (F36) are the best coilovers available for street-driven cars. SF Sport Coilovers were designed to give a wide range of ride height adjustability without reducing the spring travel. Each corner of the car has 32 levels (or clicks) of damping adjustability. This combines both the rebound and compression into one adjustment knob. The coilovers also use rubber top mounts to help reduce the noise that typically comes with high performance aftermarket coilovers. SF Coilovers come standard with an anodized coating to protect against rust and corrosion caused by extreme use and harsh external elements.

Each SF Racing Air Strut kit is built using high-strength materials and features precision damping and height adjustability. With SF Racing, you're not just upgrading your suspension—you're unlocking the freedom to dial in your look and performance with confidence. Ideal for those chasing the ultimate stance setup without sacrificing comfort, SF Air Suspension is the trusted choice for form and function.

Features

• Monotube Damper Design – Improves heat dissipation and reduces oil leakage.
• 32-Level Adjustable Damping – Fine-tune rebound and compression for ideal ride quality.
• Adjustable Ride Height – Lowers 1-2.5 inches below factory height without sacrificing suspension travel.
• Independent Lower Mount Adjustment – Maintains shock and spring integrity while adjusting height.
• T6-6061 Aluminum Construction – Lightweight, corrosion-resistant anodized top mounts, perches, and collars.
• Electroplated Shock Body – Zinc-coated for rust protection.
• Low-Friction, Pressure-Resistant Housing – Ensures smooth damping and longevity.
• Pillowball or Reinforced Rubber Top Mounts – Reduces noise while improving handling.
• SAE9254 Japanese Cold-Wound Springs – Durable and consistent performance.
• Japanese NOK Seals & Italian IP Damping Oil – Prevents leaks and ensures high-performance damping.
• Integrated Dust Boots & Bump Stops – Protects components from debris and wear.
• 100% Bolt-On Replacement – No modifications required (unless otherwise stated in the Specifications section).

Specifications

Part Number	SF-BM17-03-AS
Vehicle	2014-2015 BMW 4 Series Gran Coupe
Drivetrain
Chassis	F36
Damper Model	Air Struts
Damping Adjustability	1-Way: Rebound and Compression
Damper Size - Front	52mm diameter
Damper Size - Rear	46mm diameter
Spring Rates - Front	7.2 kg/mm
Spring Rates - Rear	11 kg/mm
Top Mounts - Front	Standard: Aluminum with Rubber Bushings Optional: Aluminum Camber Plates with Pillowball Bushings
Top Mounts - Rear	Not Applicable
Suspension Design - Front	True Coilover
Suspension Design - Rear	Divorced (Separate shock and spring)
Fitment Notes	-