Scott,
Im sorry I did not reply here before. I cant remember if you and I discussed dual exhaust stuff somewhere before. But if we did not here is what I did on the Zephyr:
My Zephyr has a stock 87-93 type 5.0L Mustang exhaust system consisting of the stock headers, stock 4 cat H-pipe, stock tubes from H-pipe to mufflers, stock mufflers, and stock stainless steel LX type tailpipes. Obviously I used a double hump crossmember - modified to fit the early F/Z mounting brackets. I used short lengths of 2-1/4 exhaust tubing to 'stretch' the exhaust system between the stock tubes and the mufflers due to the F/Zs 5" greater wheelbase. The mufflers mount using the stock Mustang forward mounts/rubber. The necessary holes are already in the unibody (near the forward rear upper control are mounting brackets) for the U-nuts that the brackets mount with. The only 'problem' (not really) that I had was there is no threaded holes in the rear frame rails that the late Mustang has for mounting the tailpipe hanger brackets. So I got everything bolted in (bolts hand tight) and supported each tailpipe by putting the rubber isolator and mount on the tailpipe and used C-clamps to clamp the stock brackets in place on the rear frame rails - repositioning them until I had the pipes in the right location and even/level. I had the fuel tank out at the time to replace it so I had room to work. I then marked the frame rail thru the holes in the mounting brackets. I then removed the clamps and using a right angle head on my drill and shortened bits I drilled pilot holes in the frame rails. I then used stainless steel self threading screws to permanently mount the tailpipe hanger brackets. Im using a stock (although new) 78 Zephyr fuel tank (carb type) and have NO clearance issues with it and either tailpipe. Its a bit close on the passenger side but no closer than on stock Mustangs.
It sounds like you already know most of how to do your exhaust but I just thought I'd add my info.
Paul
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