I heard that if i put a straight pipe on my car it will ruin my O2' sensor. the test pipe (straight pipe) im getting comes with a location for the sensor should i hook it up or not . Or was the pipe a waste of my money . I had just heard that the test pipe would relive some back pressure but not to much.I tried running open exhaust but i lost power (worst time on track).Not enough back pressure.If some one can help me out i would appreciate it .