In an effort to get rid of the lame exhaust manifold on my car, I purchased the Clifford long tube header. The instructions state that I need to remove the centering pins for the intake and replace them with header studs. If someone has already done this, and can tell me what size header studs I need that would be awesome. This is the first time I have ever used a header, so I'm fairly clueless. Also, do I need to tap threads into the holes before using header studs?