u don't need an adapter if you get the correct size outlet with the hose you're using to run from the turbo
i think the turbo outlet for which you use the cold air intake is 2.25". Most people use 3" cone filters, so you will need some type of adapter. Use T-bolt clamps too, they hold much better then worm clamps.
p.s. i have 2 3" T-bolt clamps btw if you need them
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