What is the best website to apply to refinance a car with fair credit?

I would like to refinance my jetta because my interest rate is 16%! it was my first car an i didn’t have any previous loans. I need to do it fast though… suggestions? I have fair credit and live in PA. I am looking for internet application sites for people with credit similar to mine. I would like a response by email within a week if possible.

I don’t have alot of time to waste looking! Thank you in advance.