Anyone interested take a look at my writeup with a weight comparison from my old 520 EVR3 and Pit Bull sprockets vs. 415 sprockets and DID chain.
http://www.racingorder.com/2011/09/2...ht-comparison/
I wish I had my stock sprockets to weigh, there is a huge overall difference from stock > 415, even with mine it was over 1lb reduction.