Your local welder could ad a 90 degree-turn on your exhaust for a bottle of Jack.....otherwise there are good aftermarket parts at
www.cpperformance.com that will let you exit below the swimplatform...I had a Wellcraft 197 with exhausts above the platsform and:
1. It was loud
2. It got very dirty around the pipes and it was smearing down the platform....
= less girls wanna ride with a dirty and loud boat
Godd luck over the winter with the engine