i did it to mine for overclocking reasons and there was no change at all...not in temps, not in the max overclock...i do have a snazzy keychain now though...other than that, there was no benefit to my ihs removal. who knows though, you might get lucky. if you end up doing it though, make sure you dont cut into the chip or scratch the cores...that would be bad. really bad.
good luck either way.