Best Height Adjustable Spring (HAS) Kits for G8X M2, M3 & M4

One of the first things many new G8X M2, M3, or M4 owners want to address after taking delivery is the ride height. While traditional lowering springs or full coilovers have long been the go-to solutions, modern BMWs—especially those equipped with Adaptive M Suspension (EDC)—introduce new considerations. A common modern myth is that factory dampers will fail prematurely when lowering springs are installed. While this may have been true in older generations, today’s BMW dampers have proven to be far more robust—even with lowering springs installed. In fact, many cars are seeing hundreds of thousands of miles without a single issue. To further reinforce this, BMW themselves offer a factory HAS kit, proving that damper wear concerns are largely outdated.

Many owners prefer to retain the functionality of their factory adaptive dampers, which often makes coilovers less appealing unless the car is used primarily for track days. On the other hand, static lowering springs don’t allow for any adjustability, making it difficult to dial in the perfect stance or compensate for real-world driving conditions. This is where Height Adjustable Spring (HAS) kits shine. HAS kits allow you to maintain your factory EDC system while offering ride height adjustability, giving you the best of both worlds—OEM-level comfort and control, with the ability to fine-tune your car’s stance to suit your daily use or aesthetic goals.

In this guide, we’ll break down what makes a great HAS kit and compare the top options available today for the G80 M3, G82 M4, and G87 M2 platforms.

KW Suspension Germany: Engineered Precision with OEM Heritage

KW Suspension is widely regarded as one of the most advanced and capable suspension manufacturers in the world. Beyond their extensive aftermarket offerings, KW is a trusted partner for OEM programs—designing and producing suspension systems for marques like BMW M, AMG, Dodge (Viper ACR), Audi, Ford, and Lamborghini.

For the G8X M2, M3, and M4 platforms, KW had a significant advantage: early access to the chassis thanks to a direct partnership with BMW M. This relationship gave KW engineers critical insight into factory damper settings, spring rates, and suspension geometry—allowing them to design and validate their kit before any other brand had physical access to the car. As a result, KW was first to market with a height adjustable spring (HAS) kit for the G8X, and it remains one of the most trusted options available.

KW’s suspension development is backed by real-world testing using one of the most advanced tools in the industry: a 7-post hydraulic vehicle dynamics rig housed at their R&D facility in Fichtenberg, Germany. Originally sourced from the BAR-Honda Formula 1 team, this equipment allows KW to simulate a wide range of track and road conditions with precision. Few manufacturers—OEM or aftermarket—have access to this level of testing capability.

That said, KW’s European base does come with some limitations. Due to strict TÜV regulations, the allowable range of lowering height is more conservative compared to some competitors. In our view, an “export-only” version of the HAS kit with extended height adjustment would have been a welcome addition for markets outside the EU. While the current drop meets the expectations of most G8X owners, it’s worth noting for those seeking more aggressive lowering.

Lowering Range:

G80 M3

• Front Lowering: 10 – 25 mm
• Rear Lowering: 5 – 20 mm

G82 / G83 M4 / M4 Convertible

• Front Lowering: 15 – 30 mm
• Rear Lowering: 5 – 20 mm

AST Suspension: Precision-Machined in the Netherlands

AST, headquartered in the Netherlands, designs and manufactures their G8X HAS kit entirely in-house. With a full machine shop on-site, AST has the capability for rapid prototyping and precision production, ensuring a high level of quality control throughout the development process.

The goal behind AST’s HAS kit was clear—offer one of the lowest ride height ranges available for the G8X chassis. With adjustability down to 60mm, this system caters to enthusiasts seeking an aggressive stance without sacrificing compatibility. Like the KW HAS kit, AST’s solution is fully compatible with BMW’s factory EDC dampers, preserving all electronic suspension functionality.

What further sets AST apart is their lifetime warranty, giving long-term peace of mind to owners who demand both performance and reliability.

Product Highlights:

• Height Adjustable – Fine-tune ride height instead of settling for a fixed drop.
• Lowering Range – 20mm to 60mm for a truly aggressive stance.
• EDC Compatible – Works seamlessly with standard and Adaptive M suspension systems.
• Optimized Spring Rates – Improved steering response and chassis dynamics.
• Aggressive Appearance – Engineered to deliver one of the lowest ride heights for G-series BMWs.
• Made in the Netherlands – Designed, tested, and manufactured under one roof.
• Lifetime Warranty – Coverage against spring breakage for long-term confidence.

BMW M Performance G8X M2 / M3 / M4 Suspension Kit

For G8X owners who want to maintain 100% BMW factory components without compromise, the BMW M Performance Suspension Kit is an ideal solution. Co-developed with KW Germany, this height adjustable spring (HAS) kit provides a refined drop while retaining full compatibility with BMW service and warranty standards. Unlike aftermarket alternatives, this kit includes a BMW factory label for the driver’s door jamb—clearly notifying service technicians of the M Performance suspension installation. This helps ensure your service experience remains seamless and avoids unnecessary questions during dealer visits. A unique spring perch removal tool is also included to streamline the installation process—another thoughtful touch that separates this kit from others on the market.

While the price point may be higher than third-party solutions, it delivers unmatched peace of mind for those who want a factory-backed suspension upgrade without any trade-offs.

Why Choose This Kit:

• Fully BMW OEM – Developed by BMW in collaboration with KW Germany
• Height Adjustable – Achieve the ideal stance without sacrificing ride quality or serviceability
• Dealer-Friendly – Includes BMW documentation and compliance label for smooth service visits
• EDC Compatible – Maintains full functionality with Adaptive M dampers
• Factory Warranty Safe – Designed to integrate without impacting warranty coverage
• Ease of Installation – Comes with a special tool to simplify spring perch removal

MMX Performance G8X M2 / M3 / M4 Height Adjustable Sport Spring Kit

Engineered in the UK and tested on Germany’s legendary Nürburgring, the MMX Height Adjustable Sport Spring Kit is built to perform under the most demanding conditions. The Nürburgring is one of the most rigorous proving grounds in the world, and MMX leveraged it to validate both the durability and dynamic performance of this system. Designed specifically for the G8X chassis, the MMX kit is fully compatible with BMW’s factory EDC dampers and offers a wide range of ride height adjustability—ideal for drivers who want both stance and function. The use of progressive-rate sport springs ensures a dual-character setup: composed and compliant for everyday use, yet responsive and precise during aggressive cornering.

This balance makes the MMX kit a strong option for enthusiasts who want to unlock sharper handling without sacrificing daily drivability.

Key Features:

• UK-Engineered & Nürburgring-Tested – Proven on one of the world’s most demanding circuits
• Height Adjustable – Tunable ride height for a personalized stance and improved dynamics
• Progressive Spring Rates – Comfortable ride under normal conditions, firmer support during spirited driving
• Factory EDC Compatible – Maintains full functionality with BMW’s Adaptive M suspension
• Enhanced Handling – Sharper turn-in, better chassis feedback, and improved cornering response
• Designed for Enthusiasts – Built for drivers who demand both street comfort and track-ready precision

As always, the G8X market offers a wide range of HAS kits to choose from, and this guide is intended to help you make an informed decision. At IND, our goal has never been just to sell parts—it’s to educate the community so owners end up with the best possible outcome, even if that choice isn’t purchased through us. If we come across a new kit that offers superior design, performance, or value, we’ll add it to our catalog so our customer base continues to benefit from the best the market has to offer.

Every HAS kit listed here has been installed and tested with consistently positive results. When selecting a kit, be sure to review the available ride height range and take note of the product’s origin—these details matter when modifying something as critical as your suspension system.

If you're considering a standard lowering spring without adjustability, we strongly recommend choosing a product with proven engineering. There are lower-cost options out there that may seem appealing, but lack proper real-world validation—often leading to poor ride quality and long-term issues. Given the investment required for installation, alignment, and setup, we encourage all G8X owners to do their research and prioritize quality over shortcuts. It’ll pay off in the long run.