If you use this with Two-Handed Sneak Perk (http://www.nexusmods.com/skyrim/mods/27910) make sure it's load order is after two-hand sneak perk's or it will be bypassed by the two-hand sneak's link to the original deadly aim perk.
I added some pictures of the perk tree. Not sure what else to add as it doesn't really have any visual effect apart from the attack multiplier text upon a successful sneak attack.
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