Revolution Performance Precision™ EMS:
The industry’s first fully integrated dynamic tuning control unit.

Revolution Performance has created another revolutionary product for Harley-Davidson® Twin Cam® motorcycles—the Precision™ Engine Management System.

It isn’t just another controller claiming to be self-tuning, or one that is cumbersome to install. This new EMS is a true self-optimizing system—adjusting almost instantly with little further adjustment. No resetting, no laptop, no dyno, just set it up once and ride! Other benefits include:

• Very easy to install
• Improved throttle response
• Improved fuel economy
• ’08-up TBW fully supported
• Takes full advantage of the factory ECU
• Maintains all OEM safeguards and features
• Self adjusts when you upgrade other parts on the engine

Read the full Precision story

Currently available for 2004* to present Twin Cam motorcycles, Revolution Performance will continue to expand the offering in the near future. For more information about the Revolution Performance Precision Engine Management System kits call Revolution Performance toll-free at 1-866-892-2109.
*For 2004 models, upgrade to 2005-up ECU is required.
**For 2010 Touring models the 07-09 style O2 sensor bungs are required. These can be purchased from Revolution Performance or you can install an '09 exhaust system which will already have it.

Only $819.95

Important Note to owners of bikes with factory security systems installing the RP Precision EMS.

Read what our customers have to say about the RP Precision™ EMS!

Download the Vehicle Information Sheet.

Download EMS instruction sheets (PDF format):
NOTE: The 2004 models are covered by the 2005 instructions. The ECU on 2004 models will need to be replaced by a 2005-current ECU.
2005-2007 FL models
2008-2010 FL models
2005-2010 FXS (Softail) models
2005-2010 Dyna models

See the podcast about the EMS.

Read our Frequently Asked Questions.