Grimmspeed Up Pipe – Subaru EJ | 2004+ STI / 2002+ WRX / 2005+ Legacy GT / 2009+ Forester XT

Eliminate one of the most significant exhaust flow restrictions on your EJ-powered Subaru with the Grimmspeed Up Pipe. The factory up pipe — the section of exhaust connecting the turbocharger to the downpipe — is a well-known restriction point on the EJ platform, with a restrictive catalytic converter and suboptimal geometry that limits exhaust flow and turbo spool. Grimmspeed's up pipe replaces the factory unit with a free-flowing design engineered to reduce exhaust backpressure, improve turbo spool, and support higher power levels across the EJ WRX, STI, Legacy GT, and Forester XT platforms.

Key Features

• Eliminates Factory Up Pipe Restriction: Replaces the restrictive factory up pipe and its integrated catalytic converter — a well-known exhaust flow bottleneck on the EJ platform — with a free-flowing alternative
• Improved Turbo Spool: Reduced exhaust backpressure improves turbo spool response for faster boost build and improved power delivery across the RPM range
• Broad EJ Platform Coverage: Fits the EJ-powered Subaru WRX (2002+), WRX STI (2004+), Legacy GT (2005+), and Forester XT (2009+) — one of the most widely compatible up pipe upgrades for the EJ family
• Grimmspeed Quality: Manufactured by Grimmspeed — a trusted name in Subaru performance parts with a proven track record on the WRX and STI platforms

Specifications

• Type: Up Pipe
• Engine: Subaru EJ (EJ205 / EJ255 / EJ257)
• Fitment: 2004+ Subaru WRX STI / 2002+ Subaru WRX / 2005+ Subaru Legacy GT / 2009+ Subaru Forester XT
• Part Number: 003001

Note: Up pipe replacement removes the factory catalytic converter — intended for off-road and motorsport use only. Not legal for street use in emissions-controlled jurisdictions. An ECU tune is strongly recommended after installation to optimize for the improved exhaust flow. Professional installation by an experienced Subaru shop is recommended.