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20psi is the limit of a std t3 but that depends on condition really 18psi is best to be safe, dont go just winding the boost up as the fuelling wont be able to cope and u will melt the engine, get the car set up by a tuner and he will adjust the fuelling to match the boost
have it fully set up again explain to the tuner what boost u want to run and he can set the car up to ur requirements and advise u if there are any probs