CARB Executive Order · Tuner / ECU
EO D-176-39
Dinan · Dinan Engineering Performance Software
- Executed
- October 2014
- Rows shown
- —
- PDF pages
- 4
We show basic details only for this EO. Its vehicle list is not a ruled table we can read reliably (often a scanned table or a list in the text), so we do not copy it. Check the vehicles and part numbers in the original PDF.
What the EO says about the part
The Performance Software is an ECU upgrade only. Installation is conducted using a laptop computer and Dinan Engineering data files. The new program is uploaded through the vehicle's OBD II port. There are no user adjustments; installation is only conducted by an authorized Dinan Dealer. This Executive Order is valid provided that the installation instructions for the Dinan Engineering Performance Software will not recommend tuning the vehicle to specifications different from those of the vehicle manufacturer.
Quoted from EO D-176-39. The EO exempts the part from California Vehicle Code Section 27156 only for the vehicles it lists.
More EOs from Dinan
All 51 Dinan EOs we read All vehicles with an EO-listed tuner / ecuSource: CARB Executive Order D-176-39 (PDF), retrieved November 11, 2026. EOs can be amended, superseded or revoked; CARB's copy is the authority. Independent reference, not affiliated with CARB.