Overview

The factory downpipe is highly restrictive by design, beginning right after the turbocharger. Invidia opens up the exhaust flow path with larger piping diameter and smooth bends, allowing the turbocharger to exhale exhaust gases with fewer restrictions and less turbulence. Downpipes are the most popular exhaust upgrade for a substantial bump in horsepower and torque with a significant reduction in turbo lag.

Features

• 304 stainless steel construction
• Divorced wastegate flange separates exhaust flow exiting the turbocharger
• 3" piping diameter
• Built-in high-flow catalytic converter at the lower end of the downpipe
• Extra O2 sensor bung for aftermarket wideband sensor compatibility
• Includes new exhaust gasket and hardware to connect to cat-back
• Increases horsepower and torque
• Reduces turbo lag and improves throttle response

Important Notes

• TUNE REQUIRED — Aftermarket downpipes change the power dynamic of your vehicle. A tune is mandatory to optimize power and running conditions.
• Turbo flange gasket not included — sourcing a new gasket before installation is strongly recommended.

Fitment

2008–2014 Subaru WRX
2008–2021 Subaru STI

Part Number

HS08SW1DOCB

Prop 65 Warning

⚠️ WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer, and carbon monoxide, which is known to cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.