Turbo XS WS08-DPC High Flow Catted Bellmouth Downpipe for 08-14 Subaru WRX & STI

Vehicle Fitment

• 2008-2014 Subaru WRX (All Trims, EJ255 2.5L Turbo)
• 2008-2021 Subaru WRX STI (All Trims, EJ257 2.5L Turbo)
• 2005-2009 Subaru Legacy GT (Manual Transmission only)
• 2009-2013 Subaru Forester XT (All Trims)

Fitment Notes

• Two-piece design -- upper bellmouth section and lower cat/pipe section ship and install separately
• Connects from turbocharger outlet to stock or 3" aftermarket cat-back exhaust
• Catless race pipe option: WS08-RP-V2 (sold separately -- swaps in place of cat section without buying a new downpipe)
• OEM-style doughnut gasket at turbo outlet for flexibility and sealing
• Not legal for sale or use on emissions-controlled vehicles in California

Features

• Cast 304 stainless steel bellmouth upper section -- maximum exhaust gas velocity at turbo outlet
• 3.5" diameter inlet tapering smoothly to 3.0" outlet -- higher velocity, lower restriction
• High-flow catalytic converter included -- 100cpi metal substrate
• Spare wideband O2 sensor bung pre-welded -- ready for wideband installation
• Modified pipe path for improved ground clearance on lowered vehicles
• TIG welded and polished to show-quality finish
• 5-year warranty

Specifications

• Material: 304 stainless steel throughout
• Upper section: Cast 304 SS bellmouth
• Inlet diameter: 3.5" (bellmouth)
• Outlet diameter: 3.0"
• Catalytic converter: High-flow, 100cpi metal substrate
• O2 sensor bungs: OEM bung + spare wideband bung (pre-welded)
• Gasket type: OEM-style doughnut
• Design: Two-piece
• Finish: Polished
• Warranty: 5 years

Included Components

• 1x Cast 304 SS bellmouth upper section
• 1x Lower pipe section with high-flow catalytic converter
• OEM-style doughnut gasket
• All required installation hardware

Product Description

The Turbo XS WS08-DPC is a two-piece bellmouth catted downpipe for the 2008-2014 Subaru WRX and 2008-2021 WRX STI, sharing the EJ-series turbo platform also found in the Legacy GT and Forester XT. The cast 304 stainless steel bellmouth upper section is the key design feature -- it bolts directly to the turbocharger outlet and expands exhaust flow before transitioning into the 3.5" main tube, which tapers smoothly to 3.0" where it mates to the cat-back. This geometry maximizes the pressure differential across the turbine wheel for faster spool and greater sustained power compared to straight-pipe or flanged designs.

The two-piece construction simplifies shipping and installation, and makes the system modular -- the high-flow catalytic converter section can be removed and replaced with the separately sold WS08-RP-V2 catless race pipe without purchasing a new downpipe. A spare wideband O2 sensor bung is pre-welded into the pipe for tuners running a wideband AFR gauge. TIG welded and polished to a show-quality finish throughout. Backed by Turbo XS's 5-year exhaust warranty. Not CA legal.