AST Lowering Springs For BMW 4 xDRIVE 420i/428i/430i xDRIVE 03/2014-07/2021, Front 40 , Rear 35

The AST Lowering Springs are engineered to enhance your BMW 4 xDRIVE 420i/428i/430i xDRIVE (03/2014-07/2021) by lowering its center of gravity, thereby improving handling and stability without compromising ride comfort. Manufactured using advanced cold-coiling technology on premium Wafios machines, these springs ensure exceptional durability and performance. Designed specifically for the front and rear suspension, with a lowering specification of 40 mm at the front and 35 mm at the rear, they provide a precise fit and optimal balance tailored to your vehicle’s dynamics.

Crafted from high-quality materials, the AST springs offer a progressive spring rate that maintains the original comfort levels expected from OEM components while delivering a sportier driving experience. Their design supports enhanced cornering capabilities and reduces body roll, contributing to a safer and more responsive ride. With compatibility across a wide range of models, these springs are a reliable upgrade for those seeking improved performance without sacrificing everyday usability.

Each set is backed by a lifetime warranty against breaking, reflecting the brand’s commitment to quality and customer satisfaction. Please note that these lowering springs are not suitable for 2WD (Two-Wheel Drive) vehicles, ensuring that you select the correct product for your drivetrain configuration.

Lowering Specifications

• Front: 40 mm
• Rear: 35 mm

Compatibility

• BMW 4 xDRIVE 420i/428i/430i xDRIVE
• Model years: 03/2014 - 07/2021
• Not suitable for 2WD (Two-Wheel Drive) vehicles

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.