Are any of you experiencing rich fumes. When I start my M6 car in the garage and allow it to warm the exhaust fumes are so rich my eyes burn. If I allow the car to warm with the garage door closed, when I go back into the house you can smell the exhaust in my clothes. I have eliminated the CATS. I have SLP long tube headers and Corsa Pro exhaust. I'm running closed loop with MAF. Once warm when I watch the FJO wideband it looks like I'm right on AFR. These rich fumes never go away. My exhaust tips are so black I can't get them clean. I have stock injectors and the IFR table has never been modified. MAF is completely stock (screen and non-polished). I thought moving from 22* spark to 28* spark for idle would help but it doesn't seem to have affected it. Any ideas?