Anyone run an intake without heat crossover in winter?

Carbs don't think...lol
Fuel is harder to mix when it's cold although the 10% ethanol helps to some degree as it's more volatile at lower temps. But (factory type) carbs have pull offs and linkages that help smooth out the rough spots until the heads have some temp in them. It's the parts and chambers that need to heat up. Not the carb or the intake. At below zero the bigger issue is the oil which is basically a runny jelly in the oil pan...lol