Storing Race car for winter

Supposed to get down close to freezing tomorrow night so I drained the radiator with a hand siphon pump and refilled with antifreeze and ran the water pump for a few minutes. Now good to -10, I've never seen it get below +20 around here in the winter so I should be good. Winter projects included replacing old stock leaf springs with Calvert split mono leafs, which I did last weekend, and fabbing a new windshield and installing it. I still need to get a sheet of polycarbonate and get that done, but I'm going to wait and see if there will be 1 more weekend of decent weather to take it to the track and dial in the new springs. Exhaust pipes are about 18" past the collectors and point straight to the back. I have a couple of turndowns and I was thinking of putting them on pointing sideways, the exhaust is making quite a mess under the car.