SPL Control Arms Kit for Porsche Boxster & Cayman 987 (05-12) 981 (12-16) 718 / 982 (17-26) Adjustable Rear Lower SPL RLCA 987 V2

Camber Adjustment
Increase Camber for More Peak Lateral Grip

One of the biggest improvements to rear cornering grip you can make is adding more negative camber. This also will significantly improve track event tire life by reducing heavy wear on the outer portion of the tread that occurs when there's insufficient camber angle relative to body roll.

Rear Roll Center Adjustment
Reduce Body Roll with Geometry not Spring Rate

Roll center is the imaginary point that the chassis rolls about during cornering. The distance between the roll center and the center of gravity (front-view, vertical) is essentially the amount of leverage the chassis has to produce roll.

When you lower your Porsche the roll center drops further than the center of gravity, resulting in a larger roll moment (force). Using the roll center correction spacers to correct the angle of the rear lower control arm brings the roll center back up, resulting in less body roll at the same spring rate and less tendency to oversteer with fast transitions.

With the front and rear SPL kits, you can adjust the pitch of the roll axis which can have a significant effect on the car's handling behavior with respect to over and understeer, especially through esses.

Noise, Vibration, and Harshness (NVH)

The rear lower control arms are an important part of mitigating NVH. By eliminating all bushing deflection the rear suspension will transmit more road noise, felt energy from bumps, and can increase tramlining in some cases. However, the reduction of bushing bind and reduced friction will improve ride quality over smoother roads and allow the shock to work more effectively over moderate bumps.

Tire choice, tire pressure, spring rates, and shock quality will have significant influence on ride quality as well. For daily driving, felt energy and noise can be reduced moderately by running a more compliant tire, either through reduced pressure (suitable for the load and tire) and/or taller or softer sidewalls, as well as optimized compression dampening on a quality shock.

Most drivers will find the NVH to be present and tolerable, similar to an OEM GT3 or GT4.

Replaces OEM Part Number(s)

This is a list of known OEM part numbers. OEMs constantly make changes to part numbers due to part updates, suppliers, etc so this may not be a complete list.

997 331 053 01
997 331 053 02
997 331 053 03
981 331 053 02