GrimmSpeed 2-Bolt Up-Pipe
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GrimmSpeed 2-Bolt Up-Pipe - Subaru STI (GDB/GRF/GVF/VAB) / WRX (GDA/GGA/GE8/GH8)
GrimmSpeed builds this up-pipe in-house using FARO Arm scanning and SolidWorks CAD to nail OEM header compatible fitment for the Subaru WRX STI and WRX. Built from heavy duty stainless steel with a purpose designed flex joint, it's engineered to sharpen turbo response while standing up to serious use.
This listing covers the Subaru WRX STI (GDB, GRF, GVF, VAB) and Subaru WRX (GDA, GGA, GE8, GH8) fitted with the EJ25 2-bolt header setup. Available in raw stainless steel or black ceramic thermal coated finish - choose your preferred option from the variant selector above.
Key Features
- 14 gauge 304 stainless steel tubing, CNC mandrel bent for smooth flow
- 321 stainless steel tuned bellow flex joint with interlocking liner
- 12.7mm (1/2 in) thick CNC milled 304 stainless steel flanges, hand welded inside and out
- GrimmSpeed Fire Ring multi layer steel gaskets and zinc coated mounting hardware included
- Improves turbo spool by approximately 300-400 RPM
- No tune required
Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your vehicle's year, trim level, and configuration before ordering.
Not sure if this up-pipe suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Subaru | Forester XT | EJ25 | |
| Subaru | Liberty GT | EJ25 | |
| Subaru | Outback XT | EJ25 | |
| Subaru | WRX | GDA/GGA | EJ25 |
| Subaru | WRX | GE8/GH8 | EJ25 |
| Subaru | WRX STI | GDB | EJ25 |
| Subaru | WRX STI | GRF | EJ25 |
| Subaru | WRX STI | GVF | EJ25 |
| Subaru | WRX STI | VAB | EJ25 |
Technical Specifications
| Spec | Value |
|---|---|
| Flex Joint Material | 321 Stainless Steel, "Tuned-Bellow" design with interlocking liner |
| Tubing Material & Thickness | 14-Gauge 304 Stainless Steel (approx. 2.03 mm) — 33% thicker than typical competitor tubing |
| Flange Material & Thickness | 304 Stainless Steel, 12.7 mm (1/2 in) thick, CNC milled |
| Pipe to Flange Connection | Ported flush for smooth, uninterrupted airflow |
| Construction | CNC mandrel bent tubing; flanges hand-welded inside and outside for strength |
| Finish Options | Raw Stainless Steel or Black Ceramic Thermal Coating |
| Turbo Mounting Stud Thread Size | M10 x 1.25 (5x studs) |
| Mounting Bolt Thread Size | M10 x 1.25 x 40 mm (2x bolts) |
| Flange Nut Thread Size | M10 x 1.25 (2x serrated flange nuts, 5x JIS flange nuts) |
| Washer Size | M10 (2x washers) |
| Gaskets Included | GrimmSpeed Fire Ring Multi-Layer Steel Gaskets — Up-Pipe to Turbo Gasket and Lower Up-Pipe Gasket |
| Boost Response | Spool time improved by approximately 300–400 RPM |
| Tune Required | No |
No instructions available for this product.
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