That picture was a version I tried on my sunsport. It FAILED. the heat and pressure actually melted and deformed the PVC. And that metal pipe strapping was just a temp solution to test it. It broke and failed as well. Pretty much that whole setup that is pictured above was an attempt that didn't work. I have the piping still thrown in the discard pile in the corner of my yard.
I did one later on my XLV using ABS and it's been effective. It's braced on the swim platform brackets. I also had to have an exhaust shop make a flange extension because there just wasn't enough surface area on the outside lip of the plastic exhaust flanges for the couplers to stay attached.
Hopefully these pics will still work.