SMY Cat Back Exhaust Gasket and Hardware Kit 2002-2026 WRX / 2004-2021 STI | High-Grade Class 8 Hardware | Exhaust Gasket Replacement Kit
Overview
The SMY Cat Back Exhaust Gasket and Hardware Kit is designed specifically for Subaru WRX and WRX STI models spanning 2002 through 2026. This kit addresses common issues such as rusted or leaking exhaust gaskets and hardware, providing a reliable solution for enthusiasts upgrading their exhaust system or replacing worn components after purchasing a used setup. It includes premium gaskets and durable hardware to ensure a secure, leak-free connection in your cat-back exhaust system.
Crafted with quality in mind, this kit features GrimmSpeed gaskets that are 22% thicker than OEM counterparts, constructed with seven layers for enhanced durability and sealing performance. The hardware consists of high-grade Class 8 stainless steel bolts, nuts, and washers, engineered to resist corrosion and maintain clamping force under high heat and vibration conditions typical of Subaru turbocharged exhaust systems. This combination reflects a thoughtful engineering approach focused on longevity and reliability.
For Subaru owners, maintaining a tight exhaust seal is critical to preserving performance and preventing exhaust leaks that can impact power delivery and sound quality. This gasket and hardware kit ensures a proper fit for 3-inch piping on midpipes and dual-exit catbacks, making it an essential maintenance and upgrade item. Whether restoring a factory exhaust or installing aftermarket components, this kit supports a clean, professional installation that complements Subaru’s performance heritage.
Features & Specifications
This SMY Cat Back Exhaust Gasket and Hardware Kit is engineered for Subaru WRX and WRX STI models from 2002 to 2026 and features premium GrimmSpeed multi-layer gaskets paired with Class 8 stainless steel hardware. Constructed from high-quality materials, it delivers superior sealing and corrosion resistance for Subaru enthusiasts seeking reliable exhaust system maintenance and upgrades.
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Brand: SMY
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Product: Cat Back Exhaust Gasket and Hardware Kit 2002-2026 WRX / 2004-2021 STI
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Part Number: SMY-EXT-HDGS
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Fitment: 2002-2026 Subaru WRX, 2004-2021 Subaru WRX STI
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Material: Multi-layer gasket material, Grade 8 stainless steel hardware
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Finish: Natural stainless steel finish on hardware
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Construction: 7-layer gasket, high-grade Class 8 hardware
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Origin: Not specified
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Compatibility: Replaces midpipe gaskets on 3-inch piping (not OEM midpipe), replaces Y-pipe gaskets on OEM and aftermarket dual-exit axle-back and catback exhausts
Key Benefits
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Durability: 7-layer GrimmSpeed gaskets are 22% thicker than OEM, providing enhanced sealing and longer service life.
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Corrosion Resistance: Grade 8 stainless steel hardware resists rust and maintains clamping force under heat and vibration.
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Fitment: Designed specifically for Subaru WRX and STI exhaust systems with 3-inch piping, ensuring a precise and secure fit.
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Maintenance: Ideal for replacing worn or damaged gaskets and hardware, especially on used or upgraded exhaust setups.
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Performance Integrity: Prevents exhaust leaks that can reduce power and cause unwanted noise, preserving Subaru’s turbocharged performance.
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Value: Comprehensive kit includes all necessary gaskets, bolts, nuts, and washers for a complete midpipe and Y-pipe gasket replacement.
What's Included
- 2× GrimmSpeed 022001 3 Inch 2 Bolt Gaskets (7 Layers, 22% thicker than OEM)
- 2× GrimmSpeed 020031 2 Bolt 2.25" - 2.5" Gaskets (7 Layers, 22% thicker than OEM)
- 8× M10 x 1.25 Grade 8 Stainless Steel Bolts
- 8× M10 x 1.25 Grade 8 Stainless Steel Nuts
- 8× Stainless Steel Washers
Installation & Compatibility
Installation of the SMY Cat Back Exhaust Gasket and Hardware Kit is straightforward for those with basic mechanical skills and common hand tools. The kit is a direct replacement for midpipe and Y-pipe gaskets on 3-inch exhaust piping, compatible with both OEM and aftermarket dual-exit catback and axle-back systems. No special modifications are required, but care should be taken to properly torque hardware to avoid leaks. This kit is an excellent maintenance upgrade to ensure a tight seal and prevent exhaust leaks that can affect performance and sound.
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Professional Installation: Recommended for best results but DIY-friendly for experienced enthusiasts
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and exhaust configuration before installation
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