Thanks for the comments !! i drop the sunsport tomorrow on saturday june 9th... i had to rebuilt my reverse on the tranny and it's all done and it went really well (thanks again to M. Lively and his advices) so i will reply on next monday to let you know how much it make a difference.
For Bravura88 : yes i really like the big V8 sound but it's getting annoying sometime, can't teach to my friend how to wake, can't listening my music even with my kinda big sound system, lot of fume when wakesurfing and at the sunset when we are alone on the lake some neighbor don't apreciated much the exhaust sound...
So in short i want and hope to kill the noise of 50% at least and the fume the more as possible !!
Let's the short (here in Quebec) boating season begin !!!