Strait piping is strait exhaust system no O2 sensor and a test pipe is a segment that replaces the original cat with a pipe /w mount for O2 sensor. What is the difference in HP gain/flow/ and how does your ecu manage without the O2 sensor. Besides the chemical hazards that we smell is there anything else that may go wrong in your car?


[Modified by PtRyEpLeUsDhE, 8:57 PM 9/5/2001]

 

your ecu will not appreciate being without the o2 sensor. Don't ask how I know.