I Went Down To My Local Muffler Shop To See About Getting True Duals Installed. I Currently Have About A Year Old Set Of Stainless Magnaflow Mufflers Which Are Great But Thought I Would Compliment Them With Duals. The Manager Said In Missouri They Are Illegal If They Were Not Original Equip On The Car. He Went On To Say If He Was Caught He Could Be Fined 25k And If I Got Pulled Over And The Cop Identified The Duals I Could Be Fined 25k. I Told Him I Was Already Illegal Since My Emmisions Were Removed But 25k Isnt Worth The Risk. Im sure theres more important issues to worry about in Missouri than if a car has Dual exhaust.