Perrin Positive Steering Response Kit PSRS for 03-06 Evo 8 & 9, from JSC Speed

The Perrin offers two different Positive Steering Response Kits (PSRS) for the 03-06 Lancer Evolution VIII & IX; one that does not adjust caster and one that does. Caster is the angle at that the steering knuckle rotates on. Adding caster can make your Evo 8/9 turn in faster by providing a larger contact patch as the wheels turn on the steering axis. A Perring PSRS is an anti-lift kit (ALK) designed to prevent wheel lift under hard acceleration in cornering. The anti-lift part of the kits are a very small feature compared to the overall benefits gained from using the solid connection the PSRS provides. The PSRS replaces the front control arm's rear bushing. The Evo's OEM bushing is designed to be compliant to reduce NVH, making the ride more comfortable. The compliancy of the Mitsubishi OEM bushing is not something a performance oriented driver is looking for. Eliminating the Evo's rubber OEM bushings provides significant improvement in how the car steers during hard cornering and even improves handling and stability in a straight line.

Perrin Performance Evo 8 & 9 PSRS ZERO no caster adjustment Perrin's Evo 8 & 9 PSRS Zero kit (paPEP-SUS-401) provides a solid bushing and maintains the OEM bushing's centered control arm to subframe mounting point. This centered hole keeps caster at factory settings, which is required for some racing classes (refer to your organization's rules to determine if bushing that offer caster adjustments are permitted).The Perrin PSRS Zero kit might be a better fit, adn reduce rubbing if you are running aggressive (larger) wheel fitments.

Perrin Performance Evo 8 & 9 PSRS with caster adjustment The Perrin Evo 8 & 9 PSRS kit with caster adjustment (paPEP-SUS-400) also provides a solid bushing but relocates the OEM control arm to subframe mounting point to be off center. The non-concentric hole allows your (or your installer or alignment specialist) to rotate the bushing to adjust your Evo's caster (some racing classes do not allow for an offset bushing, refer to your organization's rules for legality). The adjustable Perrin Evo PSRS can provide nearly 1.5 degrees of additional caster to your 2003-2006 Evolution.

Perrin Positive Steering Response Kit for 03-06 Evo 8 & 9