i just built one on my ranger recently.
i  took a 3" to 2" PCV reducer and connected it to the outlet on the airbox:
 
 
i then used 2 pieces of 2" PCV pipe and 2 90 degree fittings to route the piping to the inner fenderwell:
 
 
 
 
 
from here i cut a hole in the cowl housing and used 2 pieces of 2" PCV, a 2" coupler and a 90 degree fitting to complete the routing of the snorkels piping:
 
 
all piping is painted black now:
 
 
i decided to give the snorkel more air so  i added a vent. this vent is used for campers 
Danco
Galvanized Plumbing Vent Cap for Mobile Home and it worked perfectly.
first i drilled a hole in the cowl with a 3 inch dewalt hole saw, then i used a 2 inch coupler, 2 pieces of 2 inch PVC pipe, and a 90 to bring the snorkel piping up through the cowl.
 
here is the vent before bolting it down and painting it:
 
 
here is the vent painted and bolted down:
 
and here is the vent painted:
 
i have alot more pics im my gallery, just follow the link in my sig.