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

Connect your 3" aftermarket downpipe to your cat-back exhaust system on your Subaru WRX or STI with the GrimmSpeed 3" Downpipe Exhaust Adapter. When mixing aftermarket downpipes and cat-back exhaust systems from different manufacturers — or connecting a 3" downpipe to a factory or smaller-diameter cat-back — a proper transition adapter is essential for a leak-free, secure connection. GrimmSpeed's adapter is engineered specifically for the Subaru WRX and STI exhaust system configuration, providing a clean, reliable transition between the downpipe and cat-back without exhaust leaks or fitment compromises.

Key Features

• 3" Downpipe Compatibility: Designed to connect a 3" aftermarket downpipe to the cat-back exhaust system — the essential adapter for 3" downpipe builds on the Subaru WRX and STI
• Cross-Brand Compatibility: Enables connection of aftermarket downpipes and 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 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
• Downpipe Size: 3"
• Fitment: Subaru WRX / WRX STI — GR/GV/VA generations
• Part Number: 077044

Note: Verify your specific downpipe and cat-back flange configuration and diameter before ordering to confirm this adapter is the correct fitment for your exhaust combination. Professional installation recommended for a leak-free exhaust system.