How much boost can you get from the 2.6 inch pulley and is that safe for the supercharger

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Man, I don't know much about cars, but I have read on here people saying NOT to run anything smaller than a 2.8 pulley. a 2.8 pulley (my guess) would give you 3 or 4 more lbs of boost. 2.6 would be insane but you would probably have to change some stuff out. Search the forum, you may find a person who knows more than me, but from what I have seen on here, I wouldn't do it. get the 3.0 or 2.8