There is an article in this month's Kitplane on soundproofing a Zenair 601XL. However, you cannot see it on their website. They do not let you have access to most of their stories online unless you pay a subscription or pay for each individual story separately. If you want to see the article you will have to find the newsstand copy somewhere.RVadmirer said:I had missed the year of the issue. I don't have that issue. There must have been something in Kitplanes on soundproofing but I tried a search on their site with no luck. Oh well....