I'm going to be the black sheep for this thread and say that it shouldn't be that hard.
This link shows that 2 seater and 2+2 use the same front pipes and H pipeassy's.
http://www.courtesyparts.com/b....html
given that, the major difference is the piping to the mufflers. the 2+2 needsmore/longer pipes to make up for the extra chassie length.
any competent muffler shop should be able to cut behind the last flange joint and extend/bend as needed, to make a nice fit.
I have had a complete exhaust from headers back with a functional H pipe aftermarket turbo muflers in stock location and tail pipes up over the solidaxel housing and out the back fabricated from staight pipe in less than 4 hours on a 1969 mercury cougar.
I also think that trying to modify a 2+2 system to fit a 2 seater would be a lot more difficult. because of the tighter bends required.
thats my opinion based on 30 years of driving and working on cars, I bought a brand new car once let's see ya it was 1988.