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On a 1992, I would just put a "universal fit" turbo muffler on it and be done. An Official Honda Muffler is going to cost you hundreds of dollars.
there are no muffler bearings, someone is playing a joke on you
You can get quite a bit of boost with the BD-Power twin turbo kit, but it depends on your engine and how you mate the kit.
Any thing but stock, Look into getting a 5" from the turbo back with a no backflow muffler. You may get a check engine light permanently on but the truck will run much better.
A free flow muffler can improve mileage but by not by much. It would take a long time to recoup the cost of a new muffler.
Doing it yourself? Just the muffler? $50+/- Take it to a muffler shop where they'll replace the exhaust pipe, the tail pipe and the muffler with a "lifetime replacement", and it could get expensive.
Depends on what size turbo you looking at
V6 Weighs 3036 Stock. it will be more if it is a v8. and different if parts are added/removed.(Super/Turbo Charger... etc)
About 3-5 hp
The muffler doesn't have much to do with emissions. Some jurisdictions prohibit glass packs for noise reasons, but the exhaust going into the muffler is pretty much chemically identical to that going out. If a vehicle doesn't pass the emissions test with a glass pack muffler, it almost certainly wouldn't have passed with any other type of muffler either.
A turbo doesn't burn fuel, and you seem to have an incorrect notion of what a turbo does. A turbo forces more air into the cylinders.
Turbo grossed $283,828,130 worldwide.