The $350 Hondata dealer installed program does NOT include any kind of dyno time or custom tuning to your engine.
From the Hondata website:
Flashpro Dealer reflash
Price: $350 - plus any additional custom tuning as arranged with your dealer.
If you can find a Hondata dealer that will reflash your 2007-08 ECU with a custom dyno tune with your car on a chassis dyno for $350, you should go straight there!
For $350 dollars, you are going to take your TSX (with a 2007-08 ECU & with the Hondata harness adapter already installed & sync'd if your car is 2004-06) to a local Hondata dealer.
The Hondata dealer will flash an "off the shelf tune" into your car.
The tune chosen will be dependent on the configuration and modifications to your car.
If you car is near stock with a couple of bolt ons (eg, intake, header, pulleys...). The tune installed will be nearly identical, if not identical, to the standard Hondata reflash that you would get if you sent your 2004-6 ECU to Hondata in California to be reflashed.
The standard Hondata reflash has been around & fine tuned for years. For a typical mild TSX, with no dyno tuning, or data logging, it is a proven, safe and most predictable tune to install.
This is why I believe that to install a 2007-08 TSX ECU into a 2004-06 TSX plus the Hondata adapter harness, plus getting it synced from your Honda dealer & then to just get a Hondata dealer reflash is not be worth it.
If you just want the standard Hondata reflash on your 2004-06 TSX, it makes sense to me to just send in your ECU.
This is just my opinion, logically looking at the options. As I've mentioned before, discussing all these options is excellent.
So much better than if there were very few or no options for TSX ECU tuning, thanks to Hondata. :thumbsup: