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i've been told 2.25 will only be good for mild engine mods. what you got set up, i'd go with the 2.5"
Honestly I've never even heard of a person putting a UDP on their Duratec engine, because of the nature of this engine.Shadowrunner said:^ eh, i've heard so many arguements both ways... no offense to you, but i think i'll get one and try it myself. if it don't work, i'll take it off