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25mm Rear Sway Bar for 2004-07 STI


45 Minutes

Pricing: $280.00


Rear Sway bar

Take your vehicles handling to the next level with PERRIN Performance sway bars. Upgrading your sway bar is the easiest way to improve vehicle handing. Sway bars increase roll resistance and modify vehicle balance. In general, adding a larger rear sway bar increases over steer, and adding a larger front sway bar increases under steer. Upgrade both front and rear sway bars to reduce body roll and tune vehicle balance to your preference.

25mm: The Perfect Size

The PERRIN Performance 25mm Rear Sway Bar is the perfect choice for racers and enthusiasts alike.


PERRIN Performance sway bars incorporate multiple end link mounting holes which allow the installer to custom tailor their driving experience. This PERRIN sway bar increases stiffness by a minimum of 85% over stock and adjusting the end link mounting position on this sway bar can increase that stiffness to as much at 300% over stock.


PERRIN sway bars are CNC precision bent from solid 4130 chromoly steel. The entire bar is heavily powder coated to fight corrosion and give it a great red finish. We laser cut and MIG weld our bar ends for precise placement and superior strength. This type of bar end will never fail and offer you a lifetime of superior handling.


All PERRIN sway bars include custom polyurethane bushings for a crisp response and better turn in. Special spiral cut pockets carved into the bushing surface extends the interval between re-greasing.


A sway bar is an automobile suspension device. It connects opposite (left/right) wheels together through short lever arms linked by a torsion spring. A sway bar increases the suspension's roll stiffness—its resistance to roll in turns, independent of its spring rate in the vertical direction.
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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
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Warranty Details

This product features a 5 year warranty Read Full Warranty

Tech Department




2004-2007 STI

PERRIN 25mm Bar Hole #1 215% Stiffer than 19mm OEM bar
PERRIN 25mm Bar Hole #2 300% Stiffer than 19mm OEM bar

Compatibility Detail


2004-2007 STI Yes
2002-2007 WRX No

In The Box

In The Box

(1) PERRIN rear sway bar
(2) Sway bar bushings
(1) Silicon-based grease packet
(1) PERRIN License Plate Frame


Shipping Information

  • Item Requires Shipping
  • 20.0 lbs.
  • W7.0000” x H10.0000” x L49.0000”
  • This item ships in its own box.