yeah, no question a my00 wrx can take a 3" turbo back exhaust, pod/panel filter, resonator removal and a small increase in boost with a bleed valve/boost controller. but at the cost of fuel economy. which eventually clogs catalytic converters, fouls plugs and worst of all contaiminates your oil, at the end of the day it doesnt reallygive you significant gains (maybe only 10-15 hp when its all fresh)

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Long live the WRC