I have a DC Header for a Scion tC for sale. The header was used for about a year but finally decided to take it off. It still works great, there are definitely noticeable gains in the mid to high range rpms. Where your tC slowly accelerates after 45mph, this one will definitely fly a little faster. Is it as fast as turbo?... Um.. no..
But it's still a great bolt-on! Installation is a BREEZE and it always helps to have a friend.

Looking for $150, will ship on your expense.