my best set up was hooker headers(I had big pipe headers on trackI heads) with 2.5" pipes going to under pass side footwell(just like the factory dual converter set up, into a y pipe into a 3-3.5" single pipe over axle and into the best muffler you can afford.. (not a flowfarter) and one tail pipe.. the mufflers with two tail pipes make a mess of the flow.. if you have to have dual tail pipes, hang one.. for the look..
You are bang on the money here. with your exhaust system design.
These cars are very easy to make them hook. too.
But you got to start with good rear tires. The rest is easy, low cost too.