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I'm going BBK. Not that I have actually heard anything bad about the MAC LT's but just for convienence. The site that I get my parts from have both the BBK LT's and catted H pipe that fits the headers, where as I found it hard to find a set of MAC LT's and catted H pipe on the same site. I may not have searched that well for them but oh well. I'm getting the BBK's from LMPerformance.
So far so good, I love them. They are the "middle man" as I say. Right in the middle of the price range. So far they are working great, look great, feel and sound great.
I've got them, they sound really good and the gains are alright as well, but if I could go back I would go with BBK because the bolts on mine stripped out very easily.