got a 2.7T. thinking of just makin a "test pipe" complete exhaust w/ no cats. will it be a real headache dealing w/ the O2 signals if they are not actually installed in cats?

 

I have no cats on my 4.2 and the only real issue is the check engine light is always on. I was told here that i can use "spark plug defoulers" to space the O2 sensors out and prvent them from tripping the code, but I havent gotten around to it yet.