Stainless Steel Exhaust Header & Up-Pipe for Subaru Impreza WRX & WRX STI (2008-2014) 2.5L

High-Flow Stainless Steel Exhaust Header & Up-Pipe Kit for 2008-2014 Subaru WRX, WRX STI (GE/GH/GR/GV)

What it Does: The high-flow exhaust header and up-pipe kit replaces the restrictive factory exhaust manifold on the 2008-2014 Subaru WRX and WRX STI to reduce exhaust backpressure and accelerate turbocharger spool.

The Stock Subaru WRX, WRX STI Flow Restriction and Thermal Mass

Factory exhaust manifolds on the EJ255 and EJ257 boxer engines utilize heavy, rough-cast iron runners with abrupt collector angles. This uneven architecture creates severe exhaust turbulence, traps excessive thermal energy around the cylinder heads, and chokes gas velocity ahead of the turbine. Over time, recurring thermal expansion cycles on the cast iron OEM unit stress exhaust studs and delay low-end transient boost response.

The Engineering Solution

Constructed from mandrel-bent T-304 stainless steel tubing, this header and up-pipe assembly streamlines exhaust scavenging across all four cylinders. Smooth, uniform-radius primary runners merge into a low-restriction collector, maximizing pulse velocity directly into the up-pipe. Thick, precision CNC-machined flanges resist thermal warpage and prevent blowouts under high boost, while the corrosion-resistant polished finish withstands aggressive heat cycling without structural degradation.

What's Included

• 1x T-304 Stainless Steel Exhaust Header
• 1x Matching High-Flow Turbo Up-Pipe
• 1x Complete Exhaust Flange Gasket Set
• 1x Mounting Bolts and Nuts Hardware Pack

Technical Specifications

Compatibility

• 2008-2014 Subaru Impreza WRX 2.5L EJ255 Turbo
• 2008-2014 Subaru Impreza WRX STI 2.5L EJ257 Turbo

Frequently Asked Questions & Fitment Warnings

Does this fit the GE, GH, GR, GV WRX, WRX STI?

Yes, this is a direct bolt-on fit for the 2008-2014 Subaru WRX and WRX STI equipped with the EJ255 or EJ257 engine.

Do I need to retorque the mounting hardware after installation?

Yes, inspect and retorque all manifold and up-pipe flange hardware after the initial 2 to 3 thermal heat cycles to ensure proper gasket compression and prevent exhaust leaks.

The Subaru Performance Standard

For turbocharged boxer platforms on the GR and GV chassis, minimizing pre-turbine backpressure is critical for reducing cylinder temperatures and maintaining crisp throttle response throughout the mid-to-high RPM band.