Im installing porterfields, do I need those 2 little metal pieces that went on the front and back of the stock pads. Id prefer not to put them on because it requires more turning of the piston, ive been turning that piston on the rear right wheel for 2 hrs!
The only thing I can think they might do is when you step on the brake really hard they might help prevent cracking on the pad.

 

Are you talking about the anti-squeal shims? If you are, I highly suggest that you DO use them. That is if you hate brake squeal.

 

You won't break anything by not using them, but your ears may hate you.