I think mine came with instructions, but you really don't need them. After looking over it for a while, it is pretty straight forward. You just have to remove the resonators under the hood. There are two...while your at it, get rid of the one under the fender.
I plugged the one hole, but I have a snorkel
Box and filter installed. You can see where I cut one of the resonators, rather than remove it.
I made a cover out of diamond plate and put weather striping to seal it better. The plastic stock cover was too flimsy to seal out water for the snorkel.