Grimmspeed Shifter Bushing Kit 2004-2021 STI | Precision Gear Engagement | Drivetrain Upgrade Overview The Grimmspeed Shifter Bushing Kit is designed specifically for the Subaru WRX STI models from 2004 through 2021 equipped with a 6-speed manual transmission. This kit addresses the common issue of loose or vague shifting caused by worn factory rubber bushings. By replacing these with high-quality polyurethane bushings, it restores the crisp, direct feel of the shifter, enhancing driver confidence and engagement during gear changes. Engineered with a focus on durability and precision, the kit uses a combination of firmer 90A durometer polyurethane for the front bushings and a slightly softer 80A compound for the rear bushing. This balance ensures improved rigidity where needed while maintaining everyday drivability. The inclusion of precision machined 304 stainless steel inserts provides excellent load distribution and corrosion resistance, elevating the longevity and reliability of the shifter assembly. For Subaru STI owners, this upgrade means eliminating unwanted shifter play and restoring the mechanical connection between driver and transmission. The direct factory replacement design requires no modifications, making it an effective and practical solution to improve shifting feel and overall driving experience on the street or track. Features & Specifications This Grimmspeed Shifter Bushing Kit is engineered for 2004-2021 Subaru WRX STI models and features high durometer polyurethane bushings with stainless steel inserts. Constructed from durable polyurethane and 304 stainless steel, it delivers enhanced shifter precision and reduced play for enthusiasts seeking improved drivetrain engagement. Brand: Grimmspeed Product: Shifter Bushing Kit 2004-2021 STI Part Number: GRM.1153.1.0 Fitment: 2004-2021 Subaru WRX STI 6-speed manual transmission Material: Polyurethane, 304 stainless steel, zinc coated steel Finish: Natural polyurethane with zinc coated hardware Construction: Molded polyurethane bushings with precision machined stainless steel inserts Origin: Not specified Key Benefits Performance: Reduces shifter slop for more precise and confident gear engagement Durability: High durometer polyurethane and stainless steel inserts resist wear and corrosion Fitment: Direct factory replacement with no modifications required for seamless installation Driveability: Balanced bushing hardness maintains everyday comfort without sacrificing rigidity Quality: Zinc coated hardware ensures long-term reliability under demanding conditions Engagement: Restores the mechanical feel expected from a Subaru WRX STI manual transmission What's Included 1× Rear shifter bushing 2× Rear bushing sleeves 2× Front shifter bushings 1× Front bushing sleeve 2× M8 x 1.25 x 35mm flanged bolts Installation & Compatibility The Grimmspeed Shifter Bushing Kit is a direct factory replacement designed for straightforward installation without the need for modifications. Basic hand tools are sufficient for the job, making this upgrade accessible to enthusiasts with moderate mechanical experience. Professional installation is recommended if you are unfamiliar with drivetrain components or want to ensure optimal results. No tuning or additional adjustments are required after installation. Installation Instructions Professional Installation: Recommended for best results Modifications Required: None Verify Compatibility: Confirm fitment for your specific 2004-2021 Subaru WRX STI model and 6-speed manual transmission Shop with confidence at Subimods—your Subaru parts specialists.
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