Y pipe???

Go to rockauto.com and look up the exhaust system for an '86 SVO, they'll have it there (possibly with a pic)

Personally I'd recommend getting a universal Y-pipe, if you're doing a custom exhaust anway. The SVO Y is kinda weird shaped, I know I ran into problems with t on my mustang.
 
Well the SVO Y-pipe does not just "bolt up" to the stock 2.3L cat pipe, that's the main thing. The curve on the y-pipe is different or something.

At any rate I had to take it to a muffler shop and they ended up cutting the ends and welding on new ones to make everything fit, I couldn't get it to work right myself (of course, that was quite a few years ago when I didn't know quite as much as I do now)
 
Finally found it after some searching...(lots of places listed it but nobody had a picture)

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Apparently, the '85-86 GT used the same Y-pipe.

FYI to find it on Rock Auto, go to Ford -> 1986 -> Mustang SVO -> Exhaust -> Pipe.