Subaru » Impreza WRX » 2013-2015 WRX » 2013-2015 WRX
Stage 4 - 300kw
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| Stage 4 for the Subaru STI involves reprogramming the factory ECU with
ECUTEK software, install of a cold air kit, stainless steel exhaust
system, high flow top mount intercooler, upgraded injectors and high
horsepower ball bearing turbo.
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