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the Auto is faster, some manuals have problems some don't. He should be more worried about the #8 cyclinder blowing on the new 5.0's when you tuning them, unless he wants to keep it stock. with the vct the new 5.0's have a global spark controller and some tunes are changing those parameters and it causes the #8(the hottest) cylinder to go .
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2009 GT500 11.3 @124.7 (CAI/pulley/tune/xpipe) 560/558
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