457 posts · Joined 2013. #5 · Feb 9, 2014. actually I think the stock exhaust is 2.25" its doesnt matter if its 2.5" at some place, the exhaust need to be measured at its smallest point, which ive heard is 2.25 for the stock exhaust, this is why I made this thread to ask the question to as many person as possible for opinion.
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ford focus st 2.5 specs
