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The belt will need to be about 4 in (10cm) longer, there's more info in the readme file. I did get a new belt, but because it was thinner and more flexible than the stock one. Having the extra length for this tensioner was a bonus. While you're at it, you might want to print a better belt attachment, like one of these: http://www.thingiverse.com/thing:1433295, http://www.thingiverse.com/thing:1685768 or http://www.thingiverse.com/thing:2016779

belt attachment part for Anet A8
by Simhopp
Anet A8 prusa-i3 X-belt holder
by Sjouke
X Belt holder part for Anet A8 and Prusa I3 only for GT2 Belt 1.3-1.4mm
by kiss1