Well please let me know what you think of the brisk plugs. I looked at them when I changed my plugs this time but couldn't justify the cost. You'll probably gain something with a custom map but I'd wait until you've changed everything you want to first. If I'm not mistaken,there's an airbox modification that Erion espouses. I agree with changing the rear sprocket to Ti or alum and changing the chain size and gear ratio. To be honest,unless you're interested in NOS,I'd concentrate on weight savings at this point. I don't think you're going to get the results you want without cracking the cases. In my experience,when you get to this point there's a $$/hp ratio that is too steep for my wallet. Ofcourse it's your bike and your wallet so maybe it's worth it to you.