The trouble with that Boxer is the salt they put on the roads here in New England. Sunny days also means slush and then that stuff freezes onto your car with the salt. No, Ferraris are not winter cars.
Here's what I do (and I live in Maine and store the car in an unheated garage):
1-Change the oils (engine and gearbox)
2-Check/Change coolant as required
3-Fill fuel tank and add fuel stabilizer (such as Stabil)
4-Run the car to make sure the treated fuel is in the carburetors
5-While the engine is running, spray fogging oil (available at most parts stores in your area) into the carburetors or air intake
until a good white cloud of smoke pours from the exhaust (this makes sure all internal components are lightly coated with a film of the oil).
6-Remove the spark plugs and spray some fogging oil in each cylinder
7-Turn the engine over to blow out the excess oil and reinstall the plugs.
8-Spray a light coat of fogging oil on the engine surfaces.
9-Remove the battery and store it in the basement.
In the spring, put the battery back in and start it up. You’re all set, no special "spring start-up" procedures or anything like that. Just give it a bath. All the engine driven stuff I own gets this treatment before it gets stored, from the lawnmower to the Ferrari.
You'll hear a lot of people say that you should start the car up once or twice a month. I recommend against this. Once I put the car up, I do not start it again until spring. The reason for this is that when you start it your engine block will start to warm up and then when you shut the car off it cools back down and condensation will form inside the engine (one of the combustion by-products is water, HC + O2 = H2O & CO2). The condensation will cause rust on the cylinder walls and will mix with the sulphur (combustion by-product) to form sulphuric acid that sits in the bearings. The only way to boil off the water is to run the car UNDER LOAD for 20 minutes AFTER the engine is at full operating temperature. Just starting it up and letting it run in the garage for 10 or 15 minutes is actually worse than just leaving it alone.