I don't know if your boost will actually increase. My gauge reads the same now as it did in 80 degree weather. However, the colder air is denser, and my truck certainly is more responsive than during the summer. Spinning the tires at 45-50 mph now, vs. 40-45 mph in the summer.

Still waiting for snow.........

 

whats a good price to get your motor stroked to a 408?