I have just installed a test pipe in addition to the mods I already had. I am worried that I will constantly be getting a CEL for catalyst inefficiency. I am thinking of trying a MLI eliminator as seen <a href="http://www.mileliminators.com/">here.</a>
I would install this in the signal wire coming from the 2nd O2 sensor in the test pipe.

Has anyone tried something like this?

How has it worked?

I have a straight pipe on my APR stage 3 kit and RARELY get a CEL from it...like MAYBE three or four times a year. Every now and then I'll check for DTCs and might see a code for catalyst-below efficiency threshold code, but so very rarely an actual CEL. I really wouldn't sweat it.

pros = faster spoolup and more power

The stock cat is a serious bottle neck.

Im not looking foward to NJ inspection.