Well ,I took the 97 in for a emission test and failed. limit 30% opacity tested at 43%.went back the next day and failed again ,but it was 34.1%.What a ****ty ass test ,have never failed it. I guess I need to get a waiver to get my tabs, but can't find a certified AES SPECISLIST IN MY AREA ,Renton WA. DOES ANY BODY NO A PLACE IN WASHINGTON THAT IS AES CERTIFIED TO DO DIESELS .