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You could try deleting the resonators for a little more sound. It worked well in my X5 4.6is when I had it, and it's about $200.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires." 
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