dhacker, generally you will lose 1 fps for every 5 grains you increase your arrow length, which you will be doing by shooting a longer arrow. You mentioned a carbon arrow, but not which type. If it weighs in the 8-9 grain per inch range, you would be adding 16-18 grains by increasing from 27" to 29", so theoretically would lose 3-4 fps. A longer arrow has the potential to be more stable in flight, and since it will be heavier should carry more kinetic energy (hitting power), except what slight increase in ke you get from the added weight is most probably going to be lost because the arrow is moving slower, so it would probably be a wash. As far as pass throughs, theoretically the longer arrow could have more drag and friction when passing through a deer, but I suspect it would be so minute that it should be ignored... 3-4 fps lost isn't that big a deal, so I personally wouldn't worry about it..