CPI's all the way. With high end pipes like CPI's and Shearers, if you decide you dont like them, you can always get most of you money back or trade them for t5's.
Comparing my CPI's to my old t5's, my powerband came on slightly later with CPI's but the CPI's pull more harder and longer than t5's. BTW my juggs were ported for t5' and for my riding style. My current 4mil has been ported for CPI's and other things :biggrin: