Approval Details

Valid E.O.


This Executive Order approved the specified parts on on October 30, 2009.
As of Monday, July 22nd, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
HES 2101984-2004 model year Caterpillar, Cummins, Detroit Diesel, and International heavy-duty diesel engines from 7.2 liters to 16.2 liters.Rubber hose from device is connetcted to the low pressure side of the turbo.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-634-1
  • Executive Order 634-1 / D634-1
  • ARB # D-634-1
  • Executive Order No: D-634-1
  • C.A.R.B. No. D-634-1
  • Resolution D-634-1
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-634-1 PDF

D-634-1 Document:

Current View

Previous E.O. D-634 | Previous E.O. D-633 | Next E.O. D-634-2 | Next E.O. D-635