GrimmSpeed 2-Bolt Up-Pipe for EJ25 Engines

A top of the line Up-Pipe built to perform! 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 ½" 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 ½" 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. QUICK SPECS: 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 – ½" 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 WHAT'S 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 FITMENT: The GrimmSpeed 2-Bolt Up-Pipe is designed for USDM Subaru EJ25 engines with an OEM-style 2-bolt header configuration. The official fitments include: 2004-2021 Subaru STI 2006-2014 Subaru WRX 2006-2013 Subaru Forester XT 2007-2009 Subaru Legacy GT 2007-2009 Subaru Outback XT INSTALL GUIDE This product is SEMA certified for the above applications. CARB EO certification is currently in process.