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Positive Steering Response System (Zero) for 2008-10 STI/2008-14 WRX


2 Hours

Part Number
PSP-SUS-415 = Zero Offset

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Subaru Positive Steering Response System (P.S.R.S.)

Improve turn-in and increase handling prowess with the PERRIN Positive Steering Response System.

What is the PSRS?

P.S.R.S stands for Positive Steering Response System and simply replaces the front control arm, rear bushings. The OEM bushings are designed to be extra compliant to reduce NVH, and make the ride more comfortable. The compliancy of this bushing is not something a performance oriented driver is looking for. Eliminating the OEM super soft bushing provides significant improvement in how the car steers during hard cornering and even in a straight line.

OEM Bushings- Bad

Under braking and acceleration, the OEM bushing can flex enough for your wheel to move back and forth .500"! This deflection of the wheel causes drastic toe in and toe out changes under braking. The toe changes will cause steering wandering and an altered tire contact patch. When accelerating, this OEM bushing causes unwanted wheel hop and the car will want to follow the ruts in the road.


After the PERRIN PSRS is installed, under braking the wheel will have zero deflection. Since there is no way for toe changes to occur, the steering feedback issues and wandering under braking disappears. Under acceleration the car will have far less tendency to follow the ruts in the road, wheel hop will be eliminated and in turn the car will have more front end traction.

"Anti-Lift" Reduction Feature

A byproduct of the PSRS kit is that it reduces some of the built in "anti-lift" that Subaru builds into the suspension geometry. Changing the geometry toward a Pro-Lift setup which means there is more weight transfer happening under acceleration and deceleration. During acceleration this helps transfer weight to the rear of the car creating additional traction for the front tires, which reduces understeer. Same thing happens under braking.

5 Year Warranty

PERRIN Performance warrants to the original purchaser that all PERRIN products will be free from defects in material and workmanship within a sixty (60) month period from the date of purchase. *Some exclusions apply
» Read Full Warranty

Jeff's Blog

Learn in-depth about the PERRIN PSRSs and exactly how they operate and perform.
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Warranty Details

This product features a 5 year warranty Read Full Warranty

Tech Department




Material 6061 Billet Aluminum
Finish Red Anodizing
Spacers Stainless Steel

Compatibility Detail


2008-2012 WRX Yes
2008-2010 STI Yes
2005-2009 Legacy GT Yes
2008-2011 Impreza 2.5i Yes
2005-2009 Outback XT Yes
2005-2009 Legacy 2.5i Yes
2005-2009 Legacy 3.0R Yes
2009+ Forester XT Yes

NOTE: Offset PSRS will push front wheels forward on car roughly .500"

In The Box

In The Box

(1) Set of PERRIN PSRS
All necessary hardware


Shipping Information

  • Item Requires Shipping
  • 4.0 lbs.
  • W3.0000” x H7.0000” x L8.0000”
  • This item ships in its own box.