Heres a few pieces I found on Ebay you could use for adding in through hull exhaust without pulling the engine.
Heres a used set of CORSA electric diverters so you can select between the regular I/O exhaust or uncorking it when you want to.
http://cgi.ebay.com/ebaymotors/Corsa...ssoriesQ5fGear
A set of 4" through hull tips.
http://cgi.ebay.com/ebaymotors/4-STA...ssoriesQ5fGear
A set of basic diverters that lets you use both.
http://cgi.ebay.com/ebaymotors/BAJA-...ssoriesQ5fGear
And a diverter and through hull set with mufflers and flaps.
http://cgi.ebay.com/ebaymotors/Corsa...ssoriesQ5fGear
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
http://www.wellcraftv20.com/communit...ad.php?t=11664
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