I run a Rex valve with water injected bassets. I run em wet when cruising, but dry at idle and hard passes. The difference in sound is noticeable, but more important than that is safety. Get your first "header tattoo" and you'll never want dry headers.

When you buy another set, do yourself a favor and take them to get ceramic coated. They won't rust or turn blue. Embee Performance in Santa Ana did mine and they came out great.