While most Formula 1 teams debut an entirely new chassis each year, McLaren chose to evolve the existing MP4-17 into the for the 2003 season. This resulted in several unique features:
: Despite being an evolution, the 17D was reportedly over 2 seconds per lap faster than the original 17 during pre-season testing. 17.mp4
: While it retained the "MP4-17" name, team insiders noted this was misleading; almost everything except the main carbon fiber tub was brand new, including the suspension and engine. While most Formula 1 teams debut an entirely