I bought a 170 DC new back in October 2006 and after the third trip I installed a hydrofoil: yes, I didn't like drilling holes in my brand new motor but what a difference! Believe me, you will not recognize the boat: from a slow dog it became an eager planner!
http://www.performanceoutdoors.net/forums/album.php?albumid=567&attachmentid=5767
http://www.performanceoutdoors.net/forums/album.php?albumid=567&attachmentid=5767