JFulmer, the JRE exhaust system cost 550. 00 not 580. 00.
The reasons for the difference in price are many.
I Do not have a mandrel bender so I have to sub out that portion, we use 14 gauge aluminized tubing others use 16 gauge, our muffler is larger and more expensive than others, our tail pipe is adjustable for exit position, others are not, we use a cone adapter at the turbo others use a step adapter.
I hope this clears things up a bit.