If you're looking to upgrade your Stihl trimmer, you may be wondering if you can install a speed feed head. Speed feed heads can make trimming and edging your lawn a much quicker process, but unfortunately they are not compatible with all trimmer models. In general, speed feed heads are only designed for use with brush cutters. However, there are a few exceptions - some newer Stihl trimmer models (specifically the FS 56 C-E and FS 70 C-E) come with an adapter that allows you to attach a speed feed head. So if you have one of these model trimmers, feel free to upgrade to a speedier cutting experience!