Flashing your ECU is a simple process of exchanging the program of your cars ECU with a new and improved version. It takes about 15 minutes and makes quite an improvement in both NA and Turbo cars. It costs about $1000.

Evolution Motorsports has been the industry leader in this area.

Taken from the EVO (www.evoms.com )
Flashloader: The long awaited Flashloader(TM) Flashing suite for Porsche(R) applications has now been released. Currently we offer ECU reprogramming through the OBD port for all of our 996 (2000-2004) 996 Twin Turbo (2001-2004) 997 (2005) and Boxster (2000-2004) performance applications. The Flashloader process does not require soldering/de-soldering, instead our install centers can now flash a performance program into the ECU without ever removing it. This technology is an industry first and is the safest most effective way to upgrade the performance from your Porsche(R).



Procedure: The cars computer (ECU) has specific information that varies from car to car. Each ECU is coded to the cars immobilizer (anti theft computer) and contains other information such as the cars VIN #, car options, engine options as well as software that determines what country the cars origin is. When EVO or our authorized dealers upgrades your cars computer, we generate a program that is based on all of this information. We download through the OBD port the specific data about this car and create a performance file that is for your car only. At this point, the custom performance program is flashed through the OBD port just like at the factory. The whole procedure takes less than 1 hour and the performance achieved is well worth the time and money. We offer a 100% satisfaction guarantee and we will cover this upgrade with our limited lifetime warranty.