no muffs full exaust?

Yes I did this type of exhaust on two of my cars. Its not obnoxious but pretty loud. Turbo cars are different from naturally aspirated cars.... the least back pressure from turbo the better. They do make straight through mufflers that keep the noise down and do not restrict the exhaust. So if your looking for a free flowing exhaust there are options.
 
I've had this setup for a few years now and it's a great mix of Muscle Car and Air Plane. ;)

Believe it or not, some mufflers make more power than a straight pipe.

To be honest, you're not going to get a lot of takers as your GN will sound like a turbo big block. :(
After the exhaust swap I've had only a few takers and most were rich kids in daddys car.
 
I have this done to my 84 GN, my opinion sounds great and not crazy loud unless you get into it. Turbo spools nice, and can hear it through the exhaust too.
 
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