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Have you considered getting the wastegates ported and new flaps and actuators upgraded? Or you'd rather just get new bigger turbos? do these old ones have much play?
okso im not really up to speed with what is 5 and -5 are. Im guessing theyre different version of GT25's can you elaborate a little more? All i know is that theres your stock ceramic wheeled twin and theres the steel wheeled N1 style. My mate Trav has these on his GTR