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I just ordered an ATI balancer for my twin turbo Z06 and was also struggling over the cost. I ended up emailing "JC Beattie Jr" with ATI at jcbuncc@gmail.com or jc@atiracing.com. I found out that ATI sells their blems on Ebay and even know they didn't have the one I needed he put one together for me at a cost of $250 shipped to my door! From what I have heard you typically can't even tell they are blems and quite frankly I don't care I just need something that will handle the 1000 HP I will be throwing at it. I ended up ordering model #917266 as I'm now running an LS2... Good luick...