I just bough a new header for my b18a1, and where the end of the header meets the cat (the holes for the bolts) doesn't line up. The cat is a little sideways, and the header is centered. Is the piping whats wrong or is the header supposed to be tilted and i got the wrong header or something? Every other header i looked at pics of was centered, so im thinking it's the piping..? any ideas?