Nice work. Your truck doesn't look really low so the 2.5" drop isn't overkill. The headers I will be using didn't come with the O2 sensor bung in it so I'll be getting a shop to weld one in for me (and fix the hanger locations - some idiot botched the hangers on the system I salvaged from my donor wreck...) What will you be using for a meter to monitor your exhaust gases?