kevinr61 1 Report post Posted January 12, 2014 I Have a E60 M5 with 56000 klms and have been having issues with the engine check light and dealer not been able to resolve ( just kept clearing) i purchased a Scanner and have found it to be the bank 1 cat convertor ( will check input and output temps to confirm next weekend). Has any one removed cats and replaced with straight through pipes? and does anyone know who supplies replacement exhausts. ( cheaper option would be to remove the cats id suggest 1 Quote Share this post Link to post Share on other sites
kevinr61 1 Report post Posted January 14, 2014 Well after some more research i have found the following( completed temp check on the cats and found the left hand unit to be at fault with a significant temp differential between the inlet and outlet. I have since found i have a number of options to resolve being: 1. replace the cats with OEM and continue in the standard operating format ( ps you can also clean these sensors with a mixture of lemon juice and vinegar to remove carbon build up) 2. Next option is to remove or hole through the cats and have the ECU recoded/mapped to eliminate the fault code registering 3. Replace the complete exhaust and again have the ECU recoded/mapped as per item 2 I have ellected to go with option 3 which is more expensive but i would preferable as this will also be increased performance Quote Share this post Link to post Share on other sites
elmarco 56 Report post Posted January 15, 2014 You want MORE performance than the standard 500 odd HP? Jeez.... Quote Share this post Link to post Share on other sites
