'+4 Twin Cam Gear'. 288015+4 for 1999 thru 2006. 216020+4 for 2006 Dyna 200 - All,
* Advances both cams 4 crankshaft degrees
* Higher cranking and running compression
* More torque & HP... Quicker
* Eliminates lost cam motion (Cam Retarding)
* Splined Cams or Keyed Cams
* No need for Gear Drives
* Fits any Stock or High Performance Cam
* Quick Install