My 02. I dont know anybody who runs their snorkel all the way up the roll bar. We run 3" flexible RV drain tubing (WalMart) and cut the hole in the dash just above the battery. Once your under the dash and sealed up, you'll have a very hard time bringing moisture into your filter. You could probably out a small (6inch) filter inside your pvc box, run it through the fire wall and be done. It should work fine either way, keep it simple and failures will be minimal.
