I drill a small (1/16") drain hole near where the tube meets the stinger, this way you can drain the pipe if you take a dunk or flood the engine. I like to use Locktite to hold it in and it works well if it's a close fit, others have said JB weld works if the fit is looser. This simple mod brought my 11cc rigger from around 102 dB to about 91. If I use a small stinger muffler (Muck, Prather, T-Mod etc) the result is a very quiet running boat of around 88 dB. I haven't seen any power loss or excess heat doing this since the '03 season.
