Im not much in "snake oil" however autozone and most parts stores carry a product called "Guaranteed to make it pass" by a company called CRC. I had a 81 Ford pick up in Tennessee and when I bought the truck the previous owner told me it would not pass emission and he didnt have the money to fix it, thats why he was selling it so cheap. He gave me the emission test and I could have it retested for free. So, it didnt run bad at all...so I bought a bottle of this stuff for $11.00 put it in the tank drove it to the emissions place and it passed with flying colors....did it on another vehicle that had NO cats at all, poured that stuff in and BINGO..passed again....oh I bought the truck for 1200.00 and sold for 3650.00