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Don't have either, but I somehow remember reading that most like pypes over bbk. Pypes, kooks, and American racing seem to be the popular. AR are a little more pricey though.
I have pypes and have no complaints. The fitment was perfect and they held up fine after a full winter of daily driving. If I had to do it all over again I would still go with pypes
From what I have read it depends on what your future build plans are. Are you planning on going forced induction? If so that could play into what you should look at.