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I have 5.7 hemi rt 2014 , i tuned by Hptuning , i have problem with rbm couldn’t make it 6400 rbm , i only shift 6000
 

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Well, what is the redline set to? The 5.7 starts wheezing around 5200 rpm and it's kind of pointless to rev it that high. Do a cam swap and some valvetrain mods. That will wake it up and let you rev it that high
 
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