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It depends on the tune,you could have 10psi with a good tune and run for a long time,or you could have 6psi with a crap tune and blow up within a month.
how much extra power can the auto tranny take? a friend of mine who has a firebird was saying that you don't want to s/c an auto car because it won't be able to handle the power. i would think that it would be able to handle the power from the 9-10 psi of boost though.