Reflash - RSX Base 2002-2004 MT K20A3

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Reflash your 2002-2004 RSX MT (K20A3 engine) engine computer.

  • Fuel, ignition timing and cam timing optimized.
  • Rev limier optionally increased to 7300 rpm
  • 5-10 HP increase across most of the rev range.
  • 10-12 ft/lb torque increase under 5000 rpm
  • More torque than a stock K20A2 Type S under 6300 rpm. (see dyno graph)
  • No measurable difference in emissions from stock.
  • Fully dealer compatible - works with all Honda scan tools and equipment.

Hondata does not sell direct - all sales and payment must be conducted through Hondata dealers. The ECU reflash form must be sent with your ECU.


  • K20A3-M1: Revised fuel and ignition values with stock rev limit
  • K20A3-M2: Revised fuel and ignition values with 7300 rpm rev limit

Both these reflashes are based on the performance program in the dyno chart below and vary only by rev limit. VTEC point is not altered.

We do not recommend the use of this reflash with nitrous or forced induction. For these applications we recommend the K-Pro.


Within the USA this product is legal only for racing vehicles which may never be used upon a public highway.