Will installing a track pipe (with both 02 bungs) hurt my gas mileage? My front cat is falling apart, and dont really want to spend a lot of money on another. I was also wondering if anyone has had any experience with o2 sensor simulators, good or bad. Thanks for the help!

 

im currently running cat-less...yes it will hurt gas mileage for some reason, or maybe its because your getting on it more???

 

do you have both o2 sensors hooked up to your pipe? cause even with my wife driving she still gets like 22 mpg, which is quite a bit worse than it was before. is yours that bad?