They were on an 86.5 (same as 86 in regards to heads) and don't think there is any problem using the belly-pan. Not sure if they fit a GTS.

 

The 16v and 85-86 32v have a two bolt exhaust flange. The S-4 and later cars have a 3 bolt exhaust flange ( per port) .

 

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Yes, excellent upgrade for your car!!

 

That's what I'm thinking, the coating should reduce under hood temps, that will help everything else be more efficient. I'm also increasing boost slightly so may need to go to dual 2.5 or single 3.5 exhaust. I'll talk to the dyno shop when I tune and per Louie's suggestion uncork the exhaust to see if it makes much difference. I found a load bearing Mustang dyno 15 minutes away but haven't talked availability or cost yet.

 

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That's a rap.