tough call: nice 914 vs. nice and older boat
My coverking stormproof 914 version fits like a glove, but after rain the car is "wet" underneath likely from condensation
I also follow advice above and cover the expensive cover with a cheap cover. The cheap cover was the first I bought, used in the summer to catch droppings from the trees and birds, always leaves weird flaky white powder on the car like described above. Lame
What REALLY works to keep the 914 dry outside is my silver tarp. YUP, the heavy-duty tarp that you find at all hardware stores. I think it is the 8' x 14' that fits super good using bungees under the wheel wells to hold it down.
The "Perfect Combo" is nice coverking on the 914, silver tarp on top of that, and then cheap cover on top of that. I can usually "peel it off" intact! This combo kept her dry and dust free through several storms this winter. I learned the "hard way" that over-kill is needed when covering my sieve-like 914.
I love my new place in Point Reyes Station, but I miss my old garage!!