Brey Krause Carbon Fiber Strut Tower Brace. Porsche 911 1969-89  ›  R-1511

Fits:
Porsche 981 Cayman
Porsche 981 Boxster

Requires trimming of the plastic tray under the 718 and 718 GT4

Most Boxster and Cayman owners who take their cars to the track, have equipped their Porsches with tires much wider and stickier than stock, which allows higher g-forces to be achieved in cornering and braking. During that type of hard driving, the 2 piece rear sub frame flexes with the extreme loads being put on them. This negates your car's finely tuned alignment settings, thereby reducing your braking and cornering potential, and increasing tire wear. With this install, your Porsche will handle and brake with greater precision, predictability, and feedback to the driver. Comes with integrated rear tie down brackets and hardware for a 10 minute installation. Also available as a set including front tie downs, or as just the rear tie down set without the stabilizer bar.

Ultra Racing 4 Point Rear Lower Brace.

The Ultra Racing rear lower brace is designed to increase rigidity across the rear section of the Porsche 981 chassis by connecting key mounting points around the rear suspension and subframe area.

Fits:

• Porsche Boxster 981 2.7L 2012-16
• Porsche Boxster 981 S / GTS 3.4L 2012-16
• Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
• Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
• Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
• Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
• Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
• Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
• Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
• Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
• Porsche Cayman 2.7L 981 2013-16
• Porsche Cayman S / GTS 3.4L 981 2013-16
• Porsche Cayman 718 2.0L Manual (300 Bhp)
• Porsche Cayman 718 2.0L PDK (300 Bhp)
• Porsche Cayman S 718 2.5L Manual (350 Bhp)
• Porsche Cayman S 718 2.5L PDK (350 Bhp)
• Porsche Cayman T 718 2.0L Manual (300 Bhp)
• Porsche Cayman T 718 2.0L PDK (300 Bhp)
• Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
• Porsche Cayman GTS 718 2.5L PDK (365 Bhp)

Mounting points: 4
Position: Rear lower chassis / rear subframe area

During hard cornering, braking and acceleration, loads transferred through the suspension can cause a degree of movement or flex within the vehicle structure. The brace provides additional reinforcement between these mounting points, helping the rear suspension geometry remain more consistent under load.

The result is a more stable and predictable rear end, particularly during fast road driving, track days and other situations where the chassis is subjected to higher cornering loads.

What does the Ultra Racing rear lower brace do?

The suspension works most effectively when its mounting points remain stable.

As cornering forces increase, the chassis and subframe can experience small amounts of movement. Although this movement may be relatively minor, it can affect how accurately the suspension maintains its intended geometry.

The Ultra Racing rear lower brace links several important mounting points together, helping distribute loads across a wider section of the chassis.

This can help provide:

• Increased rear chassis rigidity
• Reduced movement around suspension mounting points
• More consistent rear suspension geometry
• Improved stability during hard cornering
• Sharper and more predictable handling response
• Improved driver feedback during enthusiastic driving

Why upgrade the Porsche 981 rear chassis?

The Porsche 981 Boxster and Cayman already have a highly capable chassis, but higher cornering loads can expose movement within suspension and subframe mounting areas.

This is particularly relevant where the vehicle has been fitted with:

• Performance tyres
• Wider wheels and tyres
• Sports suspension
• Lowering springs
• Coilover suspension
• Uprated anti-roll bars
• Track-focused suspension settings

These upgrades can increase the loads transmitted through the chassis.

Adding additional chassis reinforcement helps provide a more stable platform for the suspension to work from rather than allowing some of those forces to be absorbed through chassis movement.

How can the brace improve handling?

A suspension system is designed around specific geometry.

If the suspension mounting points move slightly under heavy loads, wheel alignment angles can also change dynamically. Additional chassis reinforcement helps reduce this movement.

Drivers may notice:

• More precise rear suspension response
• Improved stability during direction changes
• Greater confidence during high-speed cornering
• More predictable behaviour close to the car's handling limits
• Improved consistency during track driving
• Better feedback through the chassis

The difference is typically most noticeable during enthusiastic driving where higher cornering and braking forces are generated.

4-point chassis reinforcement

This brace uses a 4-point mounting arrangement.

Connecting four chassis or subframe mounting locations allows forces to be distributed across a larger structural area rather than concentrating loads at individual points.

This arrangement provides additional reinforcement across the rear underside of the vehicle while retaining a relatively simple bolt-on design.

Ultra Racing construction

Ultra Racing manufactures its chassis braces using steel tubing and reinforced mounting plates designed to provide high rigidity.

Ultra Racing states that its mounting brackets typically use approximately 4–5mm steel plate, while its hollow steel tubing is generally around 1.2–1.6mm thick depending on the application. The aim is to provide a rigid structure capable of maintaining its geometry under chassis load.

Please note: This product is a special order part and once ordered it cannot be cancelled or returned without our permission.