Turbo XS ADA-3DP-OEMCB-1 3in Downpipe to OEM Cat-Back Adapter for Subaru WRX/STI

Vehicle Fitment

• Subaru WRX and STI models equipped with the OEM 2.5" donut-flange cat-back exhaust system

Fitment Notes

• Model years were not confirmed in available sourcing - verify your downpipe outlet size (3") and OEM cat-back flange match before ordering

Features

• Mates a 3" aftermarket downpipe to the factory 2.5" donut-flange cat-back
• 304 stainless steel construction resists corrosion and heat
• Includes an extra-thick, multilayered stainless steel exhaust gasket for a leak-free seal
• Eliminates the need to replace the entire cat-back when upgrading to a 3" downpipe

Specifications

• Material: 304 stainless steel
• Downpipe side: 3"
• Cat-back side: OEM 2.5" donut flange
• Gasket type: Thick multilayered stainless steel (upgraded, "-1" version)

Included Components

• 1x Stainless steel downpipe-to-cat-back adapter
• 2x Thick multilayered stainless steel exhaust gaskets

Product Description

Upgrading to a 3" downpipe usually means your factory 2.5" cat-back no longer bolts up cleanly - this adapter solves that mismatch, letting you keep the OEM cat-back while still running the larger downpipe. Built from 304 stainless steel, it's designed to handle the heat and corrosion resistance needed for long-term exhaust use.

This "-1" version steps up from the standard gasket to Turbo XS's extra-thick, multilayered stainless gasket for a more secure, leak-resistant seal at the joint - a smart choice if you've had leak issues with a standard gasket in the past or just want the more robust option from the start.