Air filter help
 

Soooo attempting to make use of a freebie. Lol
I’m running a cold induction intake. Filter is pretty worse for wear. But a buddy has an extra big gulp filter I can just have. Does anyone know how or where to get a coupling to step up to the 6in diameter of the big gulp. Filter fits in the box no issue. Just can’t connect it. Is there a part number for just the step up piece of a rotofab setup?