[HiPSI]

generally the only time you have to have an ECU reprogrammed is a change in injector size or other electrical based componentry like the MAF or a change in fuel octane. basic mechanical changes won't have a need to reprogram the ECU again because all of your sensors and the ECU will account for any changes. major mechanical upgrades such as a raised/lowered compression motor or huge turbo could also need a retune, but not likely depending on how much of a change you made.