Injen® (08-21) WRX/WRX STI 304SS Downpipe
Injen® (08-21) WRX/WRX STI 304SS Downpipe
Injen® (08-21) WRX/WRX STI 304SS Downpipe
Injen® (08-21) WRX/WRX STI 304SS Downpipe


Injen® (08-21) WRX/WRX STI 304SS Downpipe

Regular price$664.95
Shipping calculated at checkout.
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Compatible: (2.5L)

2008 - 2014 Subaru WRX 

2008 - 2021 Subaru WRX STI 


Note: This Part kit is not CARB exempt at this time and is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles.




Injen Technology has examined the stock down-pipe and found prominent potential on improving the OE design by using mandrel bent stainless steel for optimum flow and corrosion resistance. TIG-welded by hand for race proven durability and endurance and eliminating any possibility of cracking during heat cycles. All of the Injen downpipes are uniquely designed to increase exhaust velocity for improved horsepower and torque. Just like all of our other performance parts, we dyno test our Down Pipes in-house and proudly build them in Pomona, CA.


High Performance downpipe with included hi-flow catalytic convertor
For a racing downpipe without a catalytic convertor, please use Injen’s SES1204DP
Does not fit 2015+ WRX Models – STI only for 2015+
Dyno Proven gains of up to 24 hp and 12 lb-ft. of torque
Full 76MM piping made from premium 304 SS Mandrel-Bent Tubing
Beautiful CAD Designed 304 stainless steel investment cast turbo bellow
Turbo Bellow is a divorced-style design to reduce turbulence and improve performance
Turbo Bellow includes the upper O2 sensor bung
Hand Crafted and TIG Welded to Perfection for Strength and Durability
Designed and Manufactured in Pomona, CA


Install Guide: