Injen 02-07 Subaru WRX / 04-07 STi 2.5L Downpipe w/ Catalytic ConverterInjen 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
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