I don't think anybody makes an entire system, buy you can have your local muffler shop do a cat-back system for ya. My '88 has a 3" in, 3" out high flow cat closely followed by a 3" in, dual 2 1/4" out turbo style muffler chased by twin pipes that exit out under the rear bumper.
This set up flows MUCH better than the stock system and isn't so loud inside the cab that you have to crank the radio on long highway trips. I tried several different mufflers and a quiter turbo style doesn't resinate inside the cab. It has a nice rumble during normal driving, but can really roar when you get into it.