They are about $250 new(Tony Ducas Racing is still in business) and I sell good used ones for 150 shipped. Yes one made for a 787 will have a boss at the top tapped 1/8" NPT. They are loud and that's what people like about them. There is not much, if any performance increase especially over a 97SPX wb. There are a couple versions one with a baffle and one without. Both are crazy loud though.