Originally Posted by pty370z

Hi,

I don't know if this has been asked already but here it goes anyways...

I noticed that the design on your HFC's and Test Pipes is a bit different from Stillen and Berks as for the O2 sensor location concerns.. People have been getting CEL warnings after installing Stillen HFC's and some percentage of people are also getting CELs with Berks HFC's and test pipes...

Have you guys had the CEL go off with either the F.I. HFC's, F.I. RTP's, or the F.I. Cat-Back itself..??