I live around Chatsworth and there is a store called california car cover, but I dont know if that will be good enough.

Any suggestions for an 07 sti?

Its the massive spoiler thats the problem.

 

There are many types of breathable fabrics available. The big difference in price between the cheap covers (and tarps) and the good covers is due to the breathable fabrics. Never ever cover a car with a non-breathable cover. Condensation build-up under the cover can do lots of damage.

I have the max cover from empire its a 3 layer cover made from Tyvek developed by DuPont.

http://empirecovers-review.blogspot.com/