I've been quoted $400-600.00 (we're in arnolds tax and waste state) for a set of duals off a split manifold and they're guaranteed for life.
Walker ? or Flowmaster 50's (I like quiet). Aluminumized 2'' pipe, (for 292). made to fit.

Gooday
Jim

small wheel moves by fire and rod,
big wheel fires by the grace of god,
everytime that wheel turns round,
bound to cover just a little more ground.