Perrin Shifter Detent Kit 2004-2021 STI | Crisp Gear Engagement | Transmission Upgrade

Overview

The Perrin Shifter Detent Kit is a straightforward, cost-effective upgrade designed specifically for manual transmission Subaru WRX STI models from 2004 to 2021. This kit improves the tactile feedback of your gear shifts by increasing the pressure on the OEM shift rod detents, resulting in a more precise and defined feel for each gear position, including neutral. It’s ideal for enthusiasts seeking a sharper, more engaging shifting experience without extensive modifications.

Engineered with precision, the Perrin Shifter Detent Kit focuses on enhancing the mechanical feel of your transmission’s shift mechanism. By adding pressure to the existing detent springs, this kit refines the shift gate’s feedback, eliminating vague or sloppy gear engagement. Perrin Performance’s approach emphasizes reliability and simplicity, delivering a noticeable improvement in shift quality while maintaining OEM durability and fitment standards.

For Subaru WRX STI owners, this upgrade translates to a more connected driving experience, especially during spirited driving or track use. The enhanced detent pressure reduces missed shifts and gear hunting, allowing for confident, crisp gear changes that complement the performance capabilities of your manual transmission. Installation is quick and straightforward, making it an accessible enhancement for enthusiasts looking to elevate their driving enjoyment.

Features & Specifications

This Perrin Performance Shifter Detent Kit is engineered for Subaru WRX STI models from 2004 to 2021 and features increased detent spring pressure for improved shift feel. Constructed from high-quality hardware, it delivers a crisp and solid gear engagement for Subaru enthusiasts seeking enhanced transmission feedback and precision.

• Brand: Perrin Performance
• Product: Shifter Detent Kit 2004-2021 STI
• Part Number: PSP-INR-042RD
• Fitment: Subaru WRX STI (2004-2021)
• Material: Hardened Steel Bolts
• Finish: Red Anodized
• Construction: Precision Machined Hardware
• Origin: Made in USA

Key Benefits

• Performance: Provides a more defined and positive gear engagement for confident shifting.
• Durability: Uses hardened steel bolts designed to withstand repeated shifting forces.
• Fitment: Direct bolt-on replacement with perfect fit for 2004-2021 WRX STI manual transmissions.
• Installation: Quick install under one hour with included hardware and instructions.
• Driving Experience: Enhances driver feedback and reduces gear hunting for a more enjoyable manual transmission feel.

What's Included

• 5× Perrin Shifter Detent Bolts
• Installation Hardware
• Installation Instructions

Installation & Compatibility

Installation of the Perrin Shifter Detent Kit is straightforward and can be completed in under an hour with basic hand tools. The kit replaces the OEM detent bolts with upgraded hardware that increases spring pressure for improved shift feel. No special tools or modifications are required, making this a DIY-friendly upgrade for Subaru WRX STI owners comfortable with basic mechanical work. Always verify fitment for your specific model year and transmission type before installation.

• Professional Installation: DIY-Friendly
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific year and trim level of Subaru WRX STI (2004-2021)

Shop with confidence at Subimods—your Subaru parts specialists.