GrimmSpeed 2-Bolt Up-Pipe - Stainless Steel - EJ25 Engines (Inc. 2004-2021 Subaru STI / 2006-2014 Subaru WRX)

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Street-Legal Performance with SEMA Certification

GrimmSpeed’s 2-Bolt Up-Pipe for EJ25 engines is now officially SEMA Certified (SC-GRM01-0145), with CARB EO approval in progress—making it a top choice for both emissions-compliant builds and high-performance setups. Whether you're tuning for daily street use or weekend track action, this up-pipe offers the legal peace of mind and quality GrimmSpeed is known for.

 

Premium Up-Pipe Built for Performance

The GrimmSpeed 2-Bolt Up-Pipe is designed as one of the most impactful early upgrades for your Subaru. Engineered to enhance boost response and durability while maintaining emissions compliance, it’s SEMA Certified and built to deliver on fit, function, and performance. Whether you're upgrading a daily driver or prepping for the track, this up-pipe offers precise fitment, long-term reliability, and noticeable power gains right out of the box.

 

Precision Engineering Meets Purposeful Design

Developed entirely in-house with FARO Arm scanning and SolidWorks CAD software, this up-pipe was reverse-engineered for an exact OEM 2-bolt header fit. It features thick ½" CNC-machined stainless steel flanges and has been fine-tuned using real-world tolerances to ensure a leak-free seal. Each unit includes GrimmSpeed’s Fire Ring MLS gaskets and corrosion-resistant zinc-coated hardware—everything you need for installation is included. Choose from raw stainless or a black ceramic thermal-coated finish for added heat control and a clean engine bay appearance.

 

Built to Withstand and Perform

Made from top-tier domestic materials, the up-pipe features 14-gauge 304 stainless steel tubing that’s 33% thicker than most alternatives, paired with a durable 321 stainless steel flex joint with an interlocking liner. The mandrel-bent design ensures smooth airflow, while fully TIG-welded flanges—inside and out—provide unmatched strength and sealing. Every unit is crafted by certified welders to handle extreme heat and abuse, making it a trusted choice for street and performance applications.

 

Faster Spool and Better Response

By improving flow characteristics, this up-pipe reduces turbo lag and helps your turbocharger spool up 300–400 RPM faster. The result is quicker throttle response and more immediate power delivery—perfect for spirited driving, aggressive setups, and competitive use.

 

Complete Kit with Coating Options

Choose from a raw stainless finish or a black ceramic thermal-coated version for enhanced heat control. Every kit includes GrimmSpeed’s premium Fire Ring gaskets and corrosion-resistant hardware, meaning everything you need is in the box—no last-minute parts runs required.