GrimmSpeed 2-Bolt Up-Pipe for EJ25 Engines
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Details
EJ25, GrimmSpeed, 2-Bolt, Up-Pipe, GRM.1099.1.SS, GRM.1099.1.SS
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
Adding a properly designed, thoroughly tested up-pipe is one of the most effective early mods you can make to your Subaru. At GrimmSpeed, the 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 Grimmspeed's FARO Arm and advanced SolidWorks CAD software, giving them 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 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.
Grimmspeed offers 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 Grimmspeed's 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 Certified Welders/Fabricators, meaning every single up-pipe that leaves the 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.
| Year | Make | Model | Fuel | Engine |
|---|---|---|---|---|
| 2004-2021 | Subaru | STI | Gas | EJ25 |
| 2006-2014 | Subaru | WRX | Gas | EJ25 |
| 2006-2013 | Subaru | Forester XT | Gas | EJ25 |
| 2007-2009 | Subaru | Legacy GT | Gas | EJ25 |
| 2007-2009 | Subaru | Outback XT | Gas | EJ25 |
More Information
| Part Number | GRM.1099.1.SS, GRM.1099.1.BLK |
|---|---|
| Part Brand | GrimmSpeed |
| Type of Part | Uppipes |
| Engine Fitment | EJ25 |
| Length | 12 |
| Width | 10 |
| Height | 8 |
| Weight | 10.000000 |
Reviews
Fitment
EJ25, GrimmSpeed, 2-Bolt, Up-Pipe, GRM.1099.1.SS, GRM.1099.1.SS
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
Adding a properly designed, thoroughly tested up-pipe is one of the most effective early mods you can make to your Subaru. At GrimmSpeed, the 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 Grimmspeed's FARO Arm and advanced SolidWorks CAD software, giving them 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 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.
Grimmspeed offers 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 Grimmspeed's 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 Certified Welders/Fabricators, meaning every single up-pipe that leaves the 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.
| Year | Make | Model | Fuel | Engine |
|---|---|---|---|---|
| 2004-2021 | Subaru | STI | Gas | EJ25 |
| 2006-2014 | Subaru | WRX | Gas | EJ25 |
| 2006-2013 | Subaru | Forester XT | Gas | EJ25 |
| 2007-2009 | Subaru | Legacy GT | Gas | EJ25 |
| 2007-2009 | Subaru | Outback XT | Gas | EJ25 |
