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I believe it is pretty noticeable under full throttle.
http://www.ramforum.com/f158/anyone_running_k_n_intake_6_4_a-73527/
Question for anyone running a cai on a 6.4. Is it extremely loud under throttle? I had one on my 3rd gen 5.7 and hated the noise. I don't want to spend the money if I'm not going to like it.