Check out this thread under tach readings...
http://www.rcuniverse.com/forum/m_10765479/tm.htm
Certainly not 3000, but definitely in the 1000 rpm range. I've been flying these engines for years and I really don't like the stock muffler. It's very noisy and it robs power. I've done a little better with a Macs one piece, but not as well as the guy in the thread.
Jim