Does the ECU need to be REprogrammed if you install Headers?
The ECU seems to be handling the extra breathing room just fine without a reprogram. From past experiance, HO's run very rich from the factory, resulting in black transom. The CMI's leaned the motor out so not as much soot on the back. The headers will take a full day to install due to the need to relocate the shifter plate, the fuel pump, the remote oil filter, the power steering tank and the ecu. The result of the CMI install was more top speed (about 4 mph) much better midrange acceleration, better sound and they look good. If I can help you any questions, let me know
John M