Dave's point about the uncontrollable power is very valid. You have to understand that his point depends on the driver. A "green" driver won't have the same ability to control the pull 400awhp has. Plenty of totaled WRX and STI out there with stock power already. Now up the power, chop a couple seconds off the 1/4 times and you've got a recipe for the tree mod.
Still the same issue with experienced drivers but the driver mod is more important with more power.