Kris,
I haven't done it myself but I've read reviews where others have and its no good! In fact it tends to just lower the temps of both parts (CPU and Heatsink). With that said though give it a go yourself and see how it works out. I did install the transpiper on the PWM heatsink but the heat just wouldn't travel past the connection between heatpipe and transpiper fins.

On a separate note has anyone tried messing around with GTL's voltages when running a dual core processor, is there anything to be gained from it? My initial thought was that it was only for quad cores but I've seen people enabled the GTL's with dual core? Granted I could just check it out myself but before devoting hours to testing I was hoping someone might post their experience with it?