SPL RTA 981 Rear Toe Arms for 2013-2016 Porsche 981 Boxster Cayman and 2017 Up Porsche 718 Boxster Cayman

The SPL RTA 981 Rear Toe Arms are a direct replacement for the factory toe links on the 2013-2016 Porsche 981 Boxster and Cayman, and the 2017 and newer Porsche 718 Boxster and Cayman (982 chassis). The SPL RTA 981 eliminates OEM rubber bushing deflection and provides a wide range of toe and bump steer adjustment that the factory links simply cannot offer. Gun-drilled from 2024-T351 anodized aluminum with Teflon-lined FK Heim joints and SPL's signature rotating clamp design, these arms are engineered for high performance street use and motorsport competition alike.

Sold as a pair. Made in the USA.

Why the SPL RTA 981 Outperforms Factory Toe Links

The factory rear toe links on the 981 and 982 Porsche platform use rubber bushings at the pivot points. Under lateral load, those rubber bushings compress, deflect, and flex introducing inconsistent toe changes that the driver never asked for. Every time the car corners hard, the rear suspension geometry shifts slightly away from where you set it. The result is reduced response, inconsistent turn-in feel, and a rear end that moves around when it should be planted.

When a 981 or 718 is lowered, the problem compounds. The factory links are not designed to operate at reduced ride heights and introduce excess toe-in that falls outside the factory alignment adjustment range. You end up with rear toe you cannot dial out, rapid inner tire wear, and a car that pushes into understeer when it should rotate cleanly.

The SPL RTA 981 solves both problems. The rubber bushings are replaced entirely with Teflon-lined FK Heim joints that rotate freely in all directions without deflection or bind. Adjustment is built into the arm design, giving a wide range of toe correction that covers both factory-height and lowered applications.

Construction and Materials

Every SPL RTA 981 arm starts as a 2024-T351 aluminum billet. The main link is gun-drilled to reduce weight without sacrificing structural rigidity. The aluminum is black anodized for corrosion resistance and appearance. SPL's engineering team uses Computer Aided Design and Finite Element Analysis on every component to verify strength margins under real-world suspension loads before any part goes into production.

The rod ends are high misalignment, low friction, 3-piece Teflon-lined FK Heim joints. The Teflon liner eliminates metal-on-metal contact at the pivot point, reduces friction across the full range of angular motion, and extends service life compared to non-lined rod ends. The 360-degree rotation of the Heim joint allows the arm to move freely through the full suspension travel without binding at any point in the travel.

SPL's rotating clamp design replaces the traditional jam nut locking method. Standard adjustment arms require you to hold the rod end in position while simultaneously tightening a jam nut which inevitably rotates the rod end slightly as you tighten, throwing off your adjustment. SPL's clamp locks the rod end in place independently, so the adjustment you set is exactly the adjustment that gets locked in. No jam nut rotation error, no re-checking after torquing.

Fitment for Porsche 981 and 982 Chassis

The SPL RTA 981 fits all variants of the 2013-2016 Porsche 981 Boxster and Cayman and all variants of the 2017 and newer Porsche 718 Boxster and 718 Cayman (982 chassis). No trim level restrictions apply within these chassis families. Confirm your chassis code before ordering.

Full Specifications

Won't Void Your Porsche Factory Warranty

Under the federal Magnuson-Moss Warranty Act, Porsche cannot void your factory warranty simply because you installed aftermarket suspension arms. They would need to demonstrate that the SPL RTA 981 directly caused the specific failure being claimed before any warranty denial could be upheld. The SPL RTA 981 does not alter, remove, or interfere with any emissions equipment or electronic systems on the vehicle.

About SPL Parts

SPL Parts designs and manufactures precision suspension components in the USA. Every SPL component is engineered using CAD and FEA structural analysis, then manufactured from aircraft-grade aluminum and high-quality rod end hardware. SPL's product line covers a wide range of performance and motorsport applications with a consistent focus on precise adjustability, zero bushing deflection, and long-term durability. The rotating clamp locking system and gun-drilled aluminum construction are signature SPL engineering features found across their entire suspension lineup.

Frequently Asked Questions

Does the SPL RTA 981 fit the 2013-2016 Porsche 981 Boxster and Cayman?
Yes. The SPL RTA 981 is a confirmed direct fit for all variants of the 2013-2016 Porsche 981 Boxster and Cayman. No trim exclusions apply within the 981 chassis family.

Does the SPL RTA 981 fit the Porsche 718 Boxster and Cayman?
Yes. The SPL RTA 981 fits all 2017 and newer Porsche 718 Boxster and 718 Cayman models on the 982 chassis. SPL lists fitment as open-ended for the 718 generation, covering all trims and variants through current production.

Will the SPL RTA 981 fit a lowered 981 or 718?
Yes, and this is specifically one of the primary use cases for these arms. When a 981 or 718 is lowered, the factory toe links create excess toe-in that falls outside the OEM alignment adjustment range. The SPL RTA 981 provides the adjustment range needed to restore proper rear toe geometry at lowered ride heights.

What is the advantage of Heim joints over rubber bushings in the SPL RTA 981?
Rubber bushings deflect and compress under lateral suspension loads, creating inconsistent and unpredictable toe changes during cornering. FK Teflon-lined Heim joints have no deflection and rotate freely through the full range of suspension travel. The result is a rear suspension that responds exactly where it is set and stays there through hard cornering, braking, and acceleration.

What is SPL's rotating clamp design and why does it matter?
Traditional adjustable arms use a jam nut to lock the rod end after adjustment. The problem is that tightening the jam nut rotates the rod end slightly, shifting your alignment setting as you lock it in. SPL's rotating clamp locks the rod end independently of the jam nut tightening process, so the adjustment you dial in is the adjustment that stays locked. This is especially important when chasing precise alignment targets on a track setup.

Does the SPL RTA 981 fit the Porsche 718 GT4 or Cayman GT4 RS?
SPL lists the RTA 981 for all 718 Cayman and Boxster variants on the 982 chassis without specific trim exclusions. The 718 GT4 and GT4 RS use the same 982 chassis. Verify your chassis code before ordering and contact SPL Parts directly at splparts.com if you have questions about a specific variant.

Does the SPL RTA 981 require an alignment after installation?
Yes. Any time rear toe arms are replaced or adjusted, a full four-wheel alignment is required. These arms are designed to be set to a specific toe value during alignment. Always have the car aligned on a proper alignment rack after installation.

Is the SPL RTA 981 suitable for track and autocross use?
Yes. SPL rates the RTA 981 for high performance street and race applications. The aluminum construction, Heim joints, and rotating clamp design are all features that perform in demanding track environments. The arms are used in time attack, HPDE, and wheel-to-wheel racing on the 981 and 718 platform.