exhaust tips should be 2 1/4 inches and stainless steel to be correct. Walker makes a nice exhaust for these cars. the diagram you have posted is correct for 86 - 93.
I believe walker has the 2 1/4 inch tailpipes. I have used them in the past and to be even more correct I do not clamp them, I have them welded to the muffler like the originals were. It makes for a much cleaner install.
the pipe in front of the muffler is bolted to the cat pipe, then welded to muffler inlet. Tailpipe lined up properly then welded to the output on muffler.
Be sure to push the respective front pipe and tailpipe up flush against the muffler before welding. If you want to get real serious take a set of old original ford mufflers, cut the banding and remove the factory heat shields, then reband them onto the walker replacement mufflers. that is about the best you can do if you don't have NOS stuff.
Jim Dangle at PPI has some NOS stuff but it is expensive.
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Jim
for the first time since 1998 there is only two left:
1984 Oregon SP unmarked
1986 Idaho SP
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