I posted about the exhaust smell before. But anyway people tell me that theres alot of exhaust when i drive and especially if i vtec. Also they say it smells like im running really rich when driving behind me. When i sit and let my car idle the smell of exhaust is very strong. Anyway I have noticed my gas milage has begin to suck. I just bought new plugs, wires, cold air intake filter, fuel filter and pcv but havent installed them yet. Do you think it could also be my o2 sensor or bad cat? I figured i would change everything at once. The only performance mods are aem cold air intake, dc headers, catback tanabe exhaust.

 

An exhaust leak somewhere and if its in front of your o2 sensor then your car will run rich.