pipe and waterbox help

I'm put'n a Factory Wet pipe on a 780cc in a SXI Pro hull and have a few questions...?
1. Has anyone done this and does it fit? I'm running a small fuel tank so I have lots of room up there...
2. Was thinking of running a old Westcoast silencer or just a open exhaust... don't care about the noise just the power? Does that pipe need backpressure? And how will it work with my front exhaust? Will I have trouble with too mush water in the pipe when the ski is sitting?
The motor is a big bore 750 with cylinder and case porting if that make a difference? Any ideas?
 
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