It is my understanding that they will not affect emmissions so long as the car is warm before the test. As far as the O2 sensors go you will need what are called MIL eliminators to clear the CEL. I don't know what MIL eliminators are but they can be purchased at RadioShack.


99 CSVT Green/Tan # 84 of 2760 Built on Wednesday, September 30, 1998 15.376 @ 92.00 MPH Stock 75,000Km 96 Contour GL 2.5L V6 ATX 170,000Km