I also hear good things about PWR.. either way it should be good for cooling. i don't know any significant difference in cooling as i don't have a temp gauge. i got the aluminum one because my stock plastic one cracked on me.. stock works just as good but i don't trust plastic...

i got it for 300 pick up.. from a guy that was selling it on h-t.com
thicker and cheaper than fluidyne. don't get me wrong, fluidyne works but the price doesn't work for me.