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When I took it in for 1200 mile service, Tech said he noticed the valves tied off and said it was an excellent idea. Not only the best sound, but a few extra hp throughout the rev range where the valves aren't fully opened--which is 95% of the time. There is no rattle if you tie off the valves. Read the whole thread if you haven't and don't worry about warranty. It's a non-issue.
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