Included COBB proprietary shoulder nuts allow installation of the factory spring bolts without fuss. A stainless adapter flange and included MLS gasket allows direct fit with the factory exhaust or COBB Cat-Back Exhaust utilizing the OEM donut gasket. The reinforced cast flange is less susceptible to warp during assembly and for those of you installing with the strength of Hulk. A second O2 bung is located directly after the catalytic converter and is to be used by the OEM Rear O2 sensor.Ī CAD-designed, cast 304 stainless steel, flange finishes off the tail section of the downpipe. The cast housing is capped off with a COBB logo and auxiliary O2 bung for those wanting to install a wideband sensor early in the exhaust path.Ī welded bracket utilizes the factory hard mount near the transmission reducing stress on the turbocharger mounting bolts and studs.Ĭorrosion-resistant and mandrel bent 3" 304 Stainless Steel tubing carries exhaust gasses downstream into a COBB-exclusive GESi 300 cell high flow catalytic converter. Minimizing turbulence when exhaust gasses from the wastegate join into those flowing through the turbine helps to prevent excessive back-pressure. The COBB Tuning GESi Catted 3" Downpipe begins with a CAD-designed cast bellmouth that smoothly blends air exiting the turbocharger's turbine housing. Included Adapter Utilizes Stock Donut Gasket for Optimal Sealing & Long Life.
Two O2 Bungs for Factory & Aftermarket Sensors.304 Stainless Steel for Corrosion Resistance.CAD-Designed Cast Turbo Outlet for Maximum Flow.Includes two o2 bungs for stock and aftermarket sensors. The COBB 3" GESi Catted Downpipe for 2008-2014 WRX and 2008-2020 STi models is a direct replacement piece made from 304 stainless steel construction with a bellmouth CAD designed cast turbo outlet for maximum flow. Above all, this downpipe provides a significant torque improvement in the low end and across the entire power band.COBB GESi Catted Downpipe for 2008-2020 STi/WRX - 524210 With the catted downpipe and Mishimoto tune, Mishimoto saw dyno proven gains of up to 57 whp and 52 wtq using 93 octane fuel (see additional images for dyno chart). During countless dyno pulls, Mishimoto saw gains of up to 73 whp and 64 wtq with the catted downpipe, Mishimoto tune and Mishimoto Performance Air Intake using 93 octane fuel (see additional images for dyno chart). By installing the Mishimoto Performance Stainless Steel Downpipe, the FA20-DIT exhaust system is able to breathe easier, providing a significant increase in horsepower and torque when tuned. The biggest restriction in the stock exhaust system is the downpipe. Mishimoto is proud to release the Performance Downpipe for the 2015+ Subaru WRX.
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