Bob G.,

The "Renntech ECU Performance Upgrade" takes a couple of hours. The built-in computer connector under the center of the Crossfire dashboard is connected to the laptop computer and is the only action required for the transfer. It is necessary that the M-B Technician in Germany be there at the factory at the same time for a coordinated transfer process. I know that Los Angeles (actually San Juan Capistrano) and Phoenix have actual Renntech technicians that perform this operation. Renntech's Headquarters is in Lake Park, Florida. For those that are not near a Renntech tech, the ECU can be sent to Florida overnight and they will do it, overnighting it back to you.
You can visit "http://renntechmercedes.com/chrysler/Crossfire.PDF" for more info. Contact: Bob Brady at "WBrady2410aol.com". Regular rate is $ 995. I paid $ 895.50, the previous "CrossfireShop.com" special mentioned elsewhere on this Forum.