The BBK will tarnish almost as quick as the MAC lose their coating. Either will work. I would assume that they will pass a sniffer test, but not the visual on emisions. EGR tube, goes into the Hpipe, not the header, it will have to be modified. Power, both will make. They both suck to install, if you want easy install, DONT GO WITH LONG TUBES!! (Unless you get the 5 peice design)
I got some MAC 1 5/8's for sale by the way
