it comes with an anit fouler that places the o2 sensor further out away from where the exhaust flows and the anti fouler has a smaller opening at the other end so the o2 sensor reads less which keeps the car from throwing a CEL.

A test pipe... (no anti fouler)


the anti fouler


test pipe with anti fouler and o2 sensor installed.



BUMP for original poster!

 

Thanks man. Good post. Bump i want this test pipe.

 

Guessing it is sold alredy?

 

test pipe sold