Tomei EXPREME Exhaust Manifold Unequal-Length
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Tomei EXPREME Unequal-Length Exhaust Manifold for EJ20/EJ25 single scroll turbo Subaru models. High-efficiency 4-1 design replaces the restrictive factory 4-2-1 layout, dramatically improving turbo response and spool characteristics. The unequal-length runners harness exhaust pulse scavenging to pull gases from adjacent cylinders, delivering superior mid-range torque and the classic boxer rumble. SUS304 stainless steel construction at 7.3kg versus 10.5kg factory.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Subaru | Impreza WRX STI | GC8 | EJ207 / EJ20K |
| Subaru | Impreza WRX STI | GDB (A/B) | EJ207 |
| Subaru | Impreza WRX STI | GGB | EJ207 |
| Subaru | Impreza WRX | GD | EJ205 / EJ255 |
| Subaru | Impreza WRX STI | GD | EJ257 |
| Subaru | Impreza WRX | GH/GE | EJ255 |
| Subaru | Impreza WRX / STI | GR/GV | EJ255 / EJ257 |
| Subaru | Forester | SF5 / SG5 / SH5 | EJ205 |
| Subaru | Forester | SG9 / SH9 | EJ255 |
Technical Specifications
| Specification | Tomei | Stock |
|---|---|---|
| Part Number | 193082 | – |
| Material | SUS304 Stainless Steel | Cast Iron |
| Layout | 4-1 | 4-2-1 |
| Main Pipe (OD) | Φ42.7mm | Φ42.7mm |
| Collector (OD) | Φ60.0mm | Φ42.7mm |
| Support Pipe Exit (OD) | Φ60.0mm | Φ42.7mm |
| Pipe Thickness | 2.5mm | – |
| Manifold Weight | 7.3kg | 10.5kg |
| Support Pipe Weight | 1.9kg | 2.8kg |
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