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just look at the bottom of the intake, if its flat you have an ls6, if its not you have an ls1. i have an 03 ls6 intake, forgot the part number, i can it get for you later if you like.
where did you buy it from? do you have it yet or still waiting on it. if you have it then just check the bottom, if its flat its an ls6 intake. if your still waiting on it wait till it comes in then check it. which ls6 intake is it is doesnt really matter :shrug: