I have a 2012 wrx, and the other day I decided to pop the hood to check on everything and I noticed my coolant is below the low marker in the tank. Mind you my car only has 3,800 miles on it. Its weird that the coolant is almost gone. The only mods I have done is a nameless axle back muffler delete. Any ideas of what could be causing this? The car hasn't over heated yet or anything.