My procomp exhust size is 1:5/8 in width. ..my headers are 1:1/4..it seams to me that this would cause a restriction in exhust flow any comments. ..they are bbk headers..TY!
You sure they are 1 1/4 headers? I've seen 1-1/2's, the normal I think is 1-5/8's.
With that said, if you are using pro comp heads, header size is going to be the least of your worries. My advice before you install them is take them to a machine shop to be checked out and for a valve job. Be extremely careful how much you spend on them.