That is the newest muffler that Slimline puts out. It is bigger than the older Pitts style muffer they used to put out. I was sent one of those Q series muffers when I did the review of the Great Planes Cherokee but wound up not using it. Since it was a bit bigger it interferred with the nose wheel steering arm. I had to use one of the older style mufflers instead of the Q series. Unfortunately the older style of muffer is no longer manufactured, so the only way to get one is to stumble across one at a Hobby Shop, Ebay, RCU marketplace, swap meet, or some other source.</p>

Ken</p>