I have a KKK 5222 970 3100 turbo (for 930 3.3 liter) with about 12,000 miles of use. Its in good shape and I'm thinking about selling. what is it worth?

I also have an 89' 911 turbo 930 original air filter box housing w/ used air filter which is in good shape. Part number 930 110 020 01.

Any advice is appreciated.

Mike Beeny