I did some more reading about this and it doesn't even appear to affect emmisions on our cars. Although I worry about the filter capabilities for everyday driving. Will it let to large a particle size through and possibly more dirt?

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