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The three port allows for more precision in the boost control thus allowing more aggressive settings to be used.
bob
BOB!! I'm not worthy!!
Joke and apart,these are my plans, I have a 2001 JDM Bugeye STI, would the 3 port make that much difference - Total bell mouth 3" de-cat exhaust, K&N or similar panel filter and a walbra 225 fuel pump.