Improve your STM peformance even more with the MK3 upgrade.  As if perfection had no room for improvement, the MK3 upgrade can dazzle you with even better performance than before.  KING and standard models are both eligible for the upgrade.

Upgrade STM MK1 to MK3

  • We use FedEx.   Please add a Phone Number and any special shipping considerations in the notes section when ordering. Shipping and Handling charges on purchased items will be calculated and charged separately via emailed invoice, unless otherwise noted.