My 2006 SEL V6(CAI, SCT tune, Magnaflow catback) consistently produces a muted but discernible clatter during throttle tip-in and release. This clatter- detonation?- does not occur during steady throttle application or even when ascending a hill or other times of increased engine load. I use 93 octane rated gas although the SCT tune requires only 91 octane. Would a custom tune clear this problem? Should I learn to grit my teeth and bear it?