What cats are the guys with a 408 with long tubes running? Im planing on duals all the way back with a crossover and dual mufflers. I got a pair of spun magnaflows shipped in and on the box it says pre OBDII. It didnt say anything about that on the site I ordered them from. I contacted them and they dont think they'll clean the exhaust enough to pass the emission test. So I was wondering what others were running.

 

Those magna flows are the best on the market that I know of. 99% of guys with a 408 are running no cats at all.