(Ik I already posted this once on another forum but I need the help and for others that want same cuz I'm there are) so listen up there are 4 cats on sn95 2 front and 2 back, I've heard that you can take back 2 off and the engine code won't show up for years and he has done it before and it worked but in the pics it looks like it was new pipes.But a friend mechanic told me that it will throw a code if you touch any of them front or back. Which statement is true and if mechanic friend is right then what kind of program will let me have the same gas efficiency as if the o2 sensors were still reading like should(ik you can get o2 dummies and engine light come off) but you will not have your engine timed and tuned properly enough to where u get good as gas as you did. Anyone know? And how much for the programmer?