if you cut your cat out would u put the o2 sencer back in the pipe or go with the cat sim.also more power or what more mpg?

 

i just cut mine, and left it completely open for now and no o2 sensor. (kinda dumb but im fixing it soon) its loud. as far as difference other than sound i dunno. but since it isnt all back together i dunno yet. sorry doesnt really help you

 

ya, i did my very first car and sounded great, but i dont know if it gave me more power, i think i just pushed the trottle more for the sound so i thought i was more ballzy