The best most reliable header for the GT is the Hotshot. Hotshot is supposedly th ony one, but I just bought mine, but won't get it on til next weekend. I just recently found another header for the GT, it is BFD. I know nothing about this header, and neither does anyone else, so if it is reliable/trusted, I don't know. But Hotshot is reliable. The header is better for manual owners, I've heard that with an auto you lose low end, and that is not good for an auto owner.