Re: *Cheap* replacement exhaust
Most likely the cheapest way to go is to order a better flowing muffler for fairly cheap(any catalog or performance car shop, maybe offroading shops too). I've seen some summit high flow mufflers for 40 bucks. Once you get it, stop by some local exhaust shops and see how much they will charge you for a 2 inch exhaust system.
I Calmini sells 2 inch exhaust systems, header back and catback, not sure on the price though and I have heard that they hang kinda low for most people that offroad.
I think going to a local exhaust shop would be your best bet.
88 Sammy in the garage