The company is in the USA for a start and it looks to be a typical cheap exhaust.
At the price they are asking, you'd be better off grabbing one of the JJR Hyperflow Exhausts from Just Jap in Sydney, they are around the same price ($599.00 for Cat Back according to their website) and at least you know if there is a fitting issue or other problem they will take care of it.
They are also a trader on this forum.