since i just fouled my wideband sensor i was wondering what will be the difference if i have one in my cat rather than having it before the cat? i have it sitting about 18 inches away from the turbo. will having it in the cat will also make it last longer? or get me a more inaccurate reading? i currently have it before the cat as of right now

 

Dyno 02 sniffers go to the end of the exhaust and go about 10 or so inches in. You can pretty much go as far as ou want just not too close to the outlet that it contaminates with fresh air. 18" away from the turbo IMO is pretty ideal