I am getting an O.S. .55 AX for a WM Ultimate 40S. I need a Slimline Pitts muffler. Looking at the Tower website, it only shows the muffler for .40-.46 SF/FX. I do not see one for the .55ax. Any help would be appreciated.

This is the brand new OS 55, right? They may not have a specific listing for that, but if I recall, the OS 46 and OS 50 are basically the same and from what I read, the same falls true for the new 55. So, the one listed for either the .46 or the .50 may work. This is only my opinion, I have both the OS .46 and the OS 50 and everthing seems to be interchangeable except, of course, for the internal parts.

DS.

please let me know how it runs, i have ordered one still waiting for it (lhs.. its been 3 weeks now) and well im not in a hurry as its winter time here in canada but i would still like too know how it runs

Thank you

Steven

Since this is a new engine Slimline may not have updated their website yet. My best guess would be to give Slimline a call and talk to them about it. I'm sure they have the specs on the new engine and can help get you hooked up with the proper pitts exhaust system. Here's their contact info:

Hope this helps

Ken