The PERRIN Shifter Detent Kit is an inexpensive upgrade that adds a crisp and solid feel to gear changes in your manual transmission WRX or STI.

Crisp Gear Shifts

The kit enhances gear shifting by providing a more defined feel for each gear position, including neutral. You get crisp, satisfying shifts—making manual-driving more enjoyable. 

How It Works

It increases the pressure on the OEM shift rod detents, resulting in more precise gear changes and more defined gear engagement every time. 

Explain Like I’m 5

Tiny parts that make shifting feel smoother and more precise—like a satisfying snap when you close a lid. 

Installation

Immediate improvement after install. Under 1 hour install time, and long-term reliability.

Product Details

In The Box:

• (5) PERRIN Shifter Detent Bolts

• Installation hardware

• Warranty & Instructions 

Compatibility:

• Manual transmissions only

• PSP‑INR‑042 variant for Legacy Spec B (includes extra components not needed for that transmission) 

Supported Vehicles:

• 2004–2021 STI