It just occurred to me that I will be removing the entire exhaust from the headers back in order to finalize all the welds.  This system is going to be 100% welded with no clamps except maybe to hold a hanger.  Since I will have the rear end out to replace the rear springs, that gives me the opportunity to remove it and remount it in one piece.

Since that is the case, I can turn that h-pipe upside down and take a 1/2" slice off the bottom and weld a flat plate in there, just like I did on my shock towers.

Jury is still out on the 4" trumpets that will have to stick out of the valance about 2" in order to clear the chrome trim.  I would rather have stock GT tips cut out to 2-1/2" like my old ones were.  Something about the original look...

I spent today fitting the 2-1/2" exhaust system on the car.  I want to do something different than use cheapo hangers, so I bought some rubber hangers like the Fox Mustangs used.  Now I just have to figure out how to mount them.

Since its gauranteed to not drone(how can THAT be cool?!) just do like Tony Soprano usta say...Faagiddaboudit!
Don't use no stinking H-pipe!!
 Tests prove it doesn't make ANY noticable power under 5/6 thousand RPM anyhow!!
OR...
 whine-knott..  pop a coupla holes in that fancy trans hump cover you made and route the H-pipe into the cab and run it OVER the trans hump?! Make a great supplamental heater in the winter and just throw an insulated fiberglass banket over it in the summertime!
Prob-solved.......You're welcome!
6sally6

Headers have a ball/socket joint between them and the rest of the system.  Everything aft of that point will be welded.  Since all this is planned out ahead of time, there is no need to remove any exhaust components in order to pull the transmission.

I may decide to leave the vertical joint right after the mufflers as a clamped connection.  That would allow removing the h-pipe, intermediate pipes and both mufflers as a unit, should the need present itself.  Since the chrome tips are too large to fit through the rear valance, this would also allow the tailpipes to be removed from the rear of the car.  The bad thing about using clamps on a stainless system is that you can almost never get them tight enough to keep the pies from rotating.  Maybe a clamp and a few tack welds are in order for that connection, ... just in case.

How about some well placed SS rivets to keep things from moving.  Easy to remove if need be.