I haven't heard much except perhaps a free breathing air filter (available from a few different manufacturers) and possible a reject kit. However, I've never felt the need for more power on my KLR. I have on occassion replaced the front sprocket for hill climbing and strictly off road stuff. You can use a sprocket with one less tooth. It improves the bottom end response of the bike but robs a bit from the top end. I carry both sprockets as it only takes a few minutes to change.
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