Why is caster important on a Porsche?

On a MacPherson front strut, caster increases dynamic camber gain with steering input and adds the centering torque you feel mid-corner. Setting caster correctly is one of the cheapest ways to add lateral grip.

What does anti-dive do?

Anti-dive geometry trades a small amount of suspension compliance for less front nose-dive under braking. Spacers let you tune the trade-off to your driving style and track.

Will these work with my aftermarket lower control arms?

They are designed to mate with OEM or OEM-style geometry lower arms. Pair them with SPL LCA arms for fully adjustable front geometry.

Do I need an alignment after install?

Yes. Caster, camber, and toe will all need to be re-set; bumpsteer should be checked.

Are these compatible with the GT3 or RS variants?

Most SPL applications cover Carrera, S, GT3, and Turbo variants on the listed chassis. Confirm fitment for RS / GT3 RS variants — some models have slightly different OEM geometry.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

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Description

SPL Parts Adjustable Front Caster Arms with Anti-Dive Geometry for 991 Porsche 911 and 981 / 982 / 718 Porsche Boxster / Cayman

SPL Front Caster / Tension / Trailing Arms add a wide caster adjustment range and tunable anti-dive geometry to the front suspension. Low-friction PTFE-lined FK USA spherical bearings replace the OEM rubber bushings, sharpening turn-in feel and steering centering force. Designed to work with the OEM (or OEM-style) front lower control arms, the gun-drilled 2024 aluminum hex rods and SPL’s 360° rotating clamp keep the package light and the alignment process fast. Sold as a pair.

Features

Wide caster adjustment range — set ideal caster for steering feel and lateral grip
Tunable anti-dive geometry via included 6061-T6 aluminum spacers
Low-friction PTFE-lined FK USA spherical bearings — eliminates OEM rubber bushing slop
Precision CNC-machined and gun-drilled 2024 aluminum hex rod
360° rotating clamp design for fast and accurate adjustment
Designed for use with OEM or OEM-style front lower control arms
Made in the USA

Specifications

Body Material: 2024 aluminum hex rod (gun-drilled)
Bushings: PTFE-lined FK USA spherical bearings
Caster Adjustment: Wide range — both axes corrected
Anti-Dive Adjustment: 6061-T6 spacer set included
Origin: Made in the USA

Applications

Porsche 911 (991): 2012–present
Porsche Boxster (981): 2012–2016
Porsche Boxster (982/718): 2017–present
Porsche Cayman (981): 2012–2016
Porsche Cayman (982/718): 2017–present

Notes

Sold as a pair.

Pairs with: Adjustable Front Sway Bar Endlinks for Porsche 911 (991), Boxster (981 and 982/718), and Cayman (981 and 982/718) · Adjustable Bumpsteer Tie Rod Ends for Porsche 911 (996, 997, and 991), Boxster (986, 987, 981, and 982/718), and Cayman (987, 981, and 982/718).

SPL components are made-to-order in the USA; build time will be confirmed at the time of order.

Frequently Asked Questions

Why is caster important on a Porsche? On a MacPherson front strut, caster increases dynamic camber gain with steering input and adds the centering torque you feel mid-corner. Setting caster correctly is one of the cheapest ways to add lateral grip.
What does anti-dive do? Anti-dive geometry trades a small amount of suspension compliance for less front nose-dive under braking. Spacers let you tune the trade-off to your driving style and track.
Will these work with my aftermarket lower control arms? They are designed to mate with OEM or OEM-style geometry lower arms. Pair them with SPL LCA arms for fully adjustable front geometry.
Do I need an alignment after install? Yes. Caster, camber, and toe will all need to be re-set; bumpsteer should be checked.
Are these compatible with the GT3 or RS variants? Most SPL applications cover Carrera, S, GT3, and Turbo variants on the listed chassis. Confirm fitment for RS / GT3 RS variants — some models have slightly different OEM geometry.

About SPL Parts

SPL Parts designs and manufactures top-shelf adjustable suspension components for street and track cars, with a strong focus on Porsche, Nissan, Subaru, BMW, and Toyota platforms. Every SPL arm, link, and bushing is engineered, machined, and assembled in the USA using PTFE-lined FK USA spherical bearings, gun-drilled aerospace aluminum, and class-leading hardware. Bulletproof Automotive carries the full SPL catalog and works directly with the SPL team to support every order.

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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