Chaparral 257 Ssx Premium Bowrider Chaparral 257SSX 2017 Volvo 380HP V8 with digital throttle Duo-prop stern drive 160 hours. Bowrider boats for sale on Boat Trader are available for an assortment of prices from a sensible 6875 on the more economical boat models all the way up to 508035 for the more costly models. One of the most customizable bowriders on the market the Formula 270 has lots of options to pick and choose from when deciding on and designing your ideal boat.