Got it...I think... Thanks!
2 last ?s
1) Why not weld the "top" of the down pipe (near the flex piece) to the cat as well? ie why not have the catted downpipe w/ rear O2 bung/cat/flex pipe all welded as 1 piece?
2) When welding it, should I just use the very last piece (w/ the rear O2 bung) that comes w/ the pacesetters and I will have a 3" cat that bolts straight up to my 2 1/2" catback straight pipe flange, right?