AST Lowering Springs For BMW 4 420i/430i 11/2020-, Front 40 , Rear 35

The AST Lowering Springs for BMW 4 420i/430i (11/2020-) represent a meticulously engineered solution designed to enhance your vehicle's driving dynamics by lowering its center of gravity. Manufactured using cold-coiling technology on the industry-leading Wafios coiling machines, these springs ensure exceptional precision and durability. The front springs lower the vehicle by 40 mm, while the rear springs provide a 35 mm drop, achieving a balanced stance that improves handling without compromising ride comfort.

These lowering springs are developed specifically for each vehicle model, guaranteeing an exact fit and optimized performance. By replacing the original equipment manufacturer (OEM) springs, the AST springs maintain much of the comfort expected from OEM components while delivering improved road grip and stability. Their progressive spring rate design allows for a smooth transition in suspension response, enhancing both everyday drivability and spirited driving experiences.

Crafted from premium materials and subjected to rigorous quality control, AST springs provide reliable performance over time. They are backed by a lifetime warranty against breaking, reflecting the brand’s commitment to quality and customer satisfaction. Suitable for a wide range of vehicles, including over 2500 models from 1966 to the present, these springs are a trusted choice for enthusiasts seeking to improve their vehicle’s aesthetics and performance.

Please note that these springs are not suitable for 4WD (four-wheel drive) vehicles. Additionally, vehicles equipped with M-sport or Adaptive M-sport suspension systems will experience approximately 10 mm less lowering than the stated values.

Lowering Specifications

• Front lowering: 40 mm
• Rear lowering: 35 mm
• Approximately 10 mm less lowering for vehicles with M-sport suspension
• Approximately 10 mm less lowering for vehicles with Adaptive M-sport suspension

Compatibility

• Designed specifically for BMW 4 Series 420i and 430i models from 11/2020 onwards
• Not suitable for 4WD (four-wheel drive) vehicles
• Fits vehicles with standard suspension setups
• Compatible with a wide range of vehicle models developed by AST over the years

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.