snorkel outside our defender
I made our snorkel out of 2 1/2 inch under the hood and 3 inch outside. The hose is a wire reinforced Hi temp dryer vent hose.
I then bought a cowl at a marine supply for the scoop and mounted with a metal bracket.
 snorkel on the driverside rollbar
snorkel into the fender

snorkel under the hood routing

 snorkel scoop

 

 
snorkel routing by the brake booster
Click for larger photos 
(around 100K file)
 snorkel into the airfilter canister