You could find a used borla for $300. I've seen them on here. I think someone has an spt for sale now and thise sound good and are great quality. Since most aftermarket pieces are stainless you shouldn't have to worry about rust. After 8 winters mine is still great, even the connector like was mentioned earlier only has surface rust.
I have the adapter for the borla I never used. It's brand new, you can have it cheap if you buy a hush. You'll need it for almost any dp besides stock or cobb, which is what I have.