LOL, it's a catch 22.
More power in the summer for the air-gap if you can actually find more than 2 hp, lol.
And more power in the winter since the RPM is water heated.
Purchase accordingly to when the car is driven, how often, where you live, and how you drive it. If it's just a warmed up engine and not looking to destroy some brand X'ers, just simply a driver, even if sprited driving, a regular RPM may be it for you.
Come cooler weather, you'll not like the extended warm up times of the air-gap.
Been there done that!
