I totally understand why you want 2.5" stainless straight out the back, mandrel bent & full of win.
Let me make a couple counter points, though:
If you remove every last bit of the Jeep's exhaust restriction, it still won't be much faster than stock. On the low end of noticeable. Ask me how I know.
At stock height, a 4wd jeep will turn it's front pinion & driveshaft into exhaust-maulers.
The restriction at the header pipe isn't such a bad thing, either - it tunes the exhaust flow to start scavenging around 900 RPM. remove restriction, move that figure higher (as well as increasing peak). So your off-idle gets slightly weaker even as your peak goes higher.
Looking back at all the PITA I've had with header pipes on this rig, I wouldn't have bothered if I'd known. The cat & rearward, sure : but I'd leave the header pipe alone.