GrimmSpeed 2-Bolt Up Pipe (For EJ25, Black), 2006-2014 WRX & 2004-2021 STi

Adding a properly designed, thoroughly tested up-pipe is one of the most effective early mods you can make to your Subaru. At GrimmSpeed, our goal was to create a 2-bolt up-pipe that checks every box: precise fitment, long-term durability, strong performance gains - all while meeting modern emissions standards. The result is a SEMA Certified component engineered to deliver on all fronts.
DESIGN:
This up-pipe was developed entirely in-house using our FARO Arm and advanced SolidWorks CAD software, giving us complete control over every detail - from material selection to final fitment. The result is an OEM-header-compatible up-pipe with dead-on accuracy, thanks to 1/2" CNC-milled stainless-steel flanges and reverse-engineered tolerances based on real-world data.
Each unit is packaged with a set of our proven GrimmSpeed Fire Ring multi-layer steel gaskets and corrosion-resistant zinc-coated hardware - no extra parts or trips to the parts store required. Everything you need is in the box.
We offer the pipe in two finish options to suit your build style: raw stainless steel or our black ceramic thermal coating. The thermal-coated version adds an extra layer of heat control, reducing engine bay temperatures and helping prevent heat soak - all with a cleaner visual footprint under the hood.
MATERIALS:
Only the best local raw materials are used in every GrimmSpeed 2-bolt Up-Pipe.
The flex joint is constructed from 321 Stainless Steel with an interlocking liner for durability, and the tubing itself is made from heavy-duty 14-Gauge 304 Stainless Steel - 33% thicker than most competitors' offerings. Each pipe is CNC mandrel bent for precise, smooth flow, and our 1/2" thick 304 Stainless Steel flanges are CNC-milled for tight tolerances. For superior strength, each pipe is hand-welded both inside and outside of the flange, ensuring a strong, smooth mating surface for optimal airflow. All fabrication is performed by our Certified Welders/Fabricators, meaning every single up-pipe that leaves our facility is built to handle serious abuse.
PERFORMANCE:
Flow and Boost Response:
You can expect spool times to improve by approximately 300-400 RPM, helping your turbo reach full boost faster and more efficiently. Reducing turbo lag significantly improves overall driving response and power delivery, especially in performance and track applications.

Included:
• (1x) GrimmSpeed 2-Bolt EJ Up-Pipe
• (1x) GrimmSpeed Up-Pipe to Turbo Gasket
• (1x) GrimmSpeed Lower Up-Pipe Gasket
• (5x) M10x1.25 Turbo Mounting Studs
• (2x) M10x1.25x40mm Yellow Zinc Bolts
• (2x) M10x1.25 Serrated Flange Yellow Zinc Nuts
• (2x) M10 Yellow Zinc Washers
• (5x) M10x1.25 Yellow Zinc JIS Flange Nuts
• (1x) GrimmSpeed Sticker

Features:
• Gaskets Included - GrimmSpeed Fire Ring Multi-Layer Steel Gaskets
• Flex Joint - 321 Stainless Steel "Tuned-Bellow" Design
• Tubing Thickness - Heavy Duty 14 Gauge 304 Stainless Steel (33% thicker than most competitors)
• Pipe to Flange Connection - Ported flush for a smooth, uninterrupted flow
• Flanges - 1/2" 304 Stainless Steel CNC Milled
• Finish Options - Raw Stainless Steel or Black Ceramic Thermal Coated
• Reduced Turbo Lag
• Spool ~300-400 RPM quicker
• No Tune Required
• SEMA Certified - SC-GRM01-0145 for listed fitments
• CARB EO - In process