Thread: Best cat to use with Speed Daddy headers?

It's a 2001 GTP. And Scotty, I've put 230miles on it so far. I've done the gm drive cycle where you have to put the ac and defroster on for about 2 and a half mins and drive for ten mins. I've done this three separate times from a cold start. I've got everything to say it's emissions ready /except/ for the catalyst and o2 Sensor. I'll post a pic of my emission diagnostic log in a few minutes.