Does the SPL RE F8X fit both the F8X and the newer G8X generation M2/M3/M4?

Yes. A single part number covers both the F8X generation (2014-2021 M2, M3, M4) and the G8X generation (2021+ M2, M3, M4). The rear sway bar and shock mount connection geometry is consistent across both generations for this application, which is why one part serves both without modification.

How does upgrading the rear endlinks complement an aftermarket rear sway bar on the F8X or G8X?

An aftermarket rear sway bar is rated for a specific stiffness, but that stiffness is only delivered to the chassis in full if the endlinks transmit force without loss. Factory rubber bushings absorb a portion of the bar's load through compression and deflection, which means the bar underperforms its rating at the chassis. The SPL RE F8X's FK spherical bearings transmit force directly with no deflection, allowing the full rated stiffness of the rear bar to reach the suspension. The result is more predictable and consistent rear body control, especially in sustained cornering.

What does adjustable endlink length do for a corner-balanced F8X or G8X?

Corner-balancing sets corner weights by adjusting ride height at each corner independently. If the resulting rear heights differ between left and right by even a small amount, fixed-length endlinks twist the rear sway bar and create a baseline roll stiffness imbalance that favors one side. Setting each endlink independently to produce zero preload removes that imbalance entirely, giving the rear suspension a neutral starting point where the sway bar only loads in response to body roll; not because of a height discrepancy at rest.

Do the 65-degree misalignment studs make a practical difference on the F8X rear suspension?

Yes, particularly when running an aftermarket rear sway bar at a non-standard hole position. The factory sway bar geometry was designed for one specific angle. Standard ball studs with 15 to 20 degrees of articulation accommodate only the factory position cleanly; at other hole positions they begin to bind, which restricts the bar's movement and puts premature stress on the stud joint. The 65-degree Chromoly studs articulate freely at every adjustment position without restriction, allowing the rear bar to operate at its full range of travel regardless of which hole is selected.

Are replacement rod ends available if one wears out?

Yes. SPL Parts offers replacement rod ends for the RE F8X. Contact SPL Parts directly through their website for the correct replacement part.

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Description

SPL Parts Adjustable Rear Sway Bar Endlinks for F8x / G8x BMW M2 / M3 / M4

The SPL Parts RE F8X addresses it in two directions simultaneously. Teflon-lined FK 1/2-inch bearings at the shock mount end deliver the highest load capacity available for this application and transfer rear sway bar force to the chassis directly, without rubber flex blunting the connection. Heat-treated Chromoly High Misalignment Studs at the sway bar connection provide 65 degrees of articulation; the full range needed when an aftermarket rear sway bar is used across multiple adjustment hole positions. Standard studs bind at non-factory angles and limit bar movement; the 65-degree range prevents binding at every position, preserving the bar’s rated stiffness through the full adjustment range. Length adjustment is independent on each side through the black anodized 6061-T6 aluminum turnbuckle with left and right hand threaded rod ends. That independence is the setup detail that separates properly built track cars from ones that are only partially dialed in; any side-to-side ride height variation or corner weight difference creates preload in a fixed-length endlink, giving the rear sway bar a built-in lean before the driver has done anything. Independently adjustable endlinks eliminate that lean, giving the setup a neutral, repeatable baseline.

Features

Teflon-lined FK 1/2-inch bearings at the shock mount connection; highest load capacity for this application; eliminates rubber deflection under rear sway bar load
Heat-treated Chromoly High Misalignment Studs at the sway bar connection; 65° articulation prevents binding at any adjustment hole position on any aftermarket rear sway bar
Black anodized 6061-T6 aluminum turnbuckle with left and right hand threaded rod ends; each side independently adjustable for precise zero-preload setup
Eliminates rear sway bar preload from ride height variation, spring settling, and corner weight differences; both sides set independently
Suitable for street and race applications
Made in the USA

Specifications

Body Material: 6061-T6 black anodized aluminum turnbuckle
Heim Joint: 1/2″ Teflon-lined FK USA spherical bearings
Studs: Heat-treated chromoly, 65° high misalignment
Adjustment: Length adjustable for preload elimination
Origin: Made in the USA

Applications

BMW M2: F87, G87 | 2016-2021, 2023-present
BMW M3: F80, G80, G81 | 2014-2018, 2021-present
BMW M4: F82, F83, G82, G83 | 2014-present

Notes

Installation Instructions
Replacement rod ends available, please contact us
SPL components are made-to-order in the USA; build time will be confirmed at the time of order

Frequently Asked Questions

Does the SPL RE F8X fit both the F8x and the newer G8x generation M2 / M3 / M4? Yes. A single part number covers both the F8x generation and the G8x generation. The rear sway bar and shock mount connection geometry is consistent across both generations for this application, which is why one part serves both without modification.
How does upgrading the rear endlinks complement an aftermarket rear sway bar on the F8x or G8x? An aftermarket rear sway bar is rated for a specific stiffness, but that stiffness is only delivered to the chassis in full if the endlinks transmit force without loss. Factory rubber bushings absorb a portion of the bar’s load through compression and deflection, which means the bar underperforms its rating at the chassis. The SPL RE F8X’s FK spherical bearings transmit force directly with no deflection, allowing the full rated stiffness of the rear bar to reach the suspension. The result is more predictable and consistent rear body control, especially in sustained cornering.
What does adjustable endlink length do for a corner-balanced F8x or G8x? Corner-balancing sets corner weights by adjusting ride height at each corner independently. If the resulting rear heights differ between left and right by even a small amount, fixed-length endlinks twist the rear sway bar and create a baseline roll stiffness imbalance that favors one side. Setting each endlink independently to produce zero preload removes that imbalance entirely, giving the rear suspension a neutral starting point where the sway bar only loads in response to body roll; not because of a height discrepancy at rest.
Do the 65-degree misalignment studs make a practical difference on the F8x rear suspension? Yes, particularly when running an aftermarket rear sway bar at a non-standard hole position. The factory sway bar geometry was designed for one specific angle. Standard ball studs with 15 to 20 degrees of articulation accommodate only the factory position cleanly; at other hole positions they begin to bind, which restricts the bar’s movement and puts premature stress on the stud joint. The 65-degree Chromoly studs articulate freely at every adjustment position without restriction, allowing the rear bar to operate at its full range of travel regardless of which hole is selected.
Are replacement rod ends available if one wears out? Yes. SPL Parts offers replacement rod ends for the RE F8X. Contact SPL Parts directly through their website for the correct replacement part.

About SPL Parts

SPL Parts is a USA-based manufacturer of high-performance suspension components engineered for both professional racing and demanding street applications. Built on the core principles of strength, lightweight construction, low friction, and precision, SPL Parts products deliver the adjustability and alignment performance required by top race teams and discerning enthusiasts alike. Every component is produced using USA-sourced, certified materials and machined by experienced local shops to exacting tolerances. Professional TIG welders ensure maximum weld integrity, while each part is hand-fitted and treated with anti-seize and 3M internal panel coating for lasting protection. SPL Parts conducts all research and development in-house, allowing the team to leverage firsthand product knowledge and deliver unmatched customer support. Their suspension components feature innovative adjuster designs for quicker, more precise alignments, and utilize spherical bearings with Teflon liners that are self-cleaning, self-lubricating, and built for long service life. From concept to assembly, SPL Parts is made with pride in the USA by skilled machinists and welders who are committed to quality, innovation, and performance.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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SPL Parts Adjustable Rear Sway Bar Endlinks for F8x / G8x BMW M2 / M3 / M4 [SPLREF8X]

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SPL Parts Adjustable Rear Sway Bar Endlinks for F8x / G8x BMW M2 / M3 / M4

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

Reviews