Skid plate just makes a resonant plane under the bike. It will kinda-sorta amplify rattling and you may interpret the whole engine as going up a notch on the 'tinny' scale. I can testify that it will be noticeable to some degree. It's up to you if you want to dampen it or deal with it. I lived with it on my KLR, and actually appreciated hearing the ping of rocks (or in some cases 'DING!") letting me know I ought to check things over when I stopped.