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I have a LS3 A6...wonderful powertrain and probably will not touch it except maybe a Honker and either the new Fast or Weiand intake if they turn out to be work better than current L76 manifold. I am a big believer in stock manners and know from a discussion with an auto engineer that small incremental changes especially when it comes to cam design are the rule...if I did a cam and let's not get into the of $$$ or time discussion; I would aim for a sorta plus 1 up the scale substitution. ...in that vein has anyone tried an LPE GT2-2 or a GT2-3....looking at the specs they look like the next progression if you sorta line them up in increased specs: LS2 cam< LS3 cam < LS6 cam < LPE cam