Hello all. I am brand new at the tuning process. I just got my first HP tuner today and plan on using it on my 05 GTO. Ive put fairly rugh cam, long tube headers, hi flo cats, new lifters, timing set, oil pump, wb o2 reader. My question is this. When i get it back together this coming week, do i take to GM aND get them to do the cam/crank relearn? Is this a mandantory thing? And any suggestions on where to start? Thanks in advance