Check to see if the "Y" pipe is still there, otherwise the engine needs to
be removed to install the system. I was told a 3 db reduction relates to the
a 50% drop to what the ear here's. Go with the mufflers!

"*JimH*" wrote in message
...
We are looking at a nice 21 footer to use for water skiing, tubing and
general use on Lake Erie. The problem is that it has thru hull exhaust.

Is it easy to convert to an below the water exhaust (through the prop on
the I/O)? How much money in materials would be involved? Is it a do it
yourself project?