Dress up your Hemi engine for that custom look with our new Hemi Deco polished tubes covers. These tube covers have a threaded base that simply screws on top of our Billet tubes. They are Awesome looking and they keep water and debris out of your tubes. Note fits Hitech spark plug tubes only. Available in three different styles. Please note Mopar Logo tube cover is not available for sale. Part# HRS6 Smoothie. HRS7 Twister. HRS8 Torquer.