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Yes, you'll notice a big difference with little or no tuning adjustments. And don't be disappointed if you have a bit of valve noise, some do some don't
Should I replace the lifters while I"m at it? The bike has around 9k on it.
I would. Evo lifters are a known weak point. Yours would probably last for quite a few miles yet, but why not do it while you're in there? I had two OEM lifters fail in 100k. I have Crane now.