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would it need any retard at only 4 psi? its not a whole lot of boost, surely the standard ecu could handle that much? i am basing this on an old metro turbo i had back in the day, i know its old skool tech but that only ran 4 psi with no mods to the lump and that chucked out 110bhp ish.  And you think it would be poss to knock up a cat set up to keep it mot friendly frank? if you could do that with the t15 set up, there would be cash waiting