Speedline Weight savings?

It’s gotta be here on this site, but a search did not reveal it - what is the weight savings of the Corso Speedline 1pc. magnesiums over the Std. Rimstocks?thanks in advance.

OK nevermind - found it a prev. thread: "For track use only, consider magnesium wheels, which are half the weight of standard wheels. Saving 15kg."At: http://www.exiges.com/ubb/NonCGI/Forum1/HTML/000374.html Not worth it, if you ask me - Getting Xrays for your wheels is too much of a hassle.

15kg over the car’s weight is only 2%However, as a percentage of the unsprung weight it’s significant. I noticed that my car handles much better with magnesium rims.Your mileage may vary.

So have you had those wheels xray’d? Any crazy ideas?