GrimmSpeed Subaru Downpipe to 3" Cat-Back Exhaust Adapter – Subaru WRX / STI

Connect your Subaru WRX or STI's factory or aftermarket downpipe to a 3" cat-back exhaust system with the GrimmSpeed Downpipe to 3" Cat-Back Exhaust Adapter. When upgrading to a 3" cat-back on a vehicle with a factory or non-3" downpipe outlet, a proper transition adapter is essential for a secure, leak-free connection. GrimmSpeed's adapter is engineered specifically for the Subaru WRX and STI exhaust system configuration, providing a clean, reliable transition from the downpipe outlet to the 3" cat-back inlet without exhaust leaks or fitment compromises.

Key Features

• Downpipe to 3" Cat-Back Transition: Adapts the factory or aftermarket Subaru downpipe outlet to connect to a 3" cat-back exhaust system — the essential adapter for 3" cat-back upgrades on stock or non-3" downpipe builds
• Cross-Brand Compatibility: Enables connection of downpipes and 3" cat-back systems from different manufacturers — eliminates fitment issues when mixing exhaust components
• Leak-Free Connection: Engineered for a secure, leak-free connection between the downpipe and 3" cat-back — no exhaust leaks or fitment compromises
• Subaru WRX / STI Specific: Designed for the Subaru WRX and STI exhaust system configuration across GR/GV and VA platform generations
• GrimmSpeed Quality: Manufactured by GrimmSpeed — a trusted name in Subaru performance parts

Specifications

• Type: Downpipe to Cat-Back Exhaust Adapter
• Cat-Back Size: 3"
• Fitment: Subaru WRX / WRX STI — GR/GV/VA generations
• Part Number: 077046

Note: For connecting a 3" aftermarket downpipe to a factory or smaller cat-back, see GrimmSpeed part 077044. Verify your specific downpipe outlet and cat-back inlet flange configuration before ordering to confirm this adapter is the correct fitment for your exhaust combination. Professional installation recommended for a leak-free exhaust system.