i currently have a 2013 wrx that only has a defi boost gauge and a kartboy sts. The temperature has plummeted here in nyc and i was driving in 10F today *according to the car*. Normally when i go WOT the boost gauge will shoot up to 16 and then taper off to approx 12 and stay there. i am told that is normal. Today when i drove i noticed that it would only shoot up to approx 14 and taper to 12 psi. Is this normal because of the extreme cold or do i have a boost leak or some other problem? the car will pass muster with the dealership so if it's not normal, i'll just go to the dealership to deal with it.