Historical clue formulations

• Powerful engines — 2023-01-12
• Engines with oomph — 2021-12-08
• Powerful engines — 2015-09-23
• Some muscle cars — 2010-12-31
• Supercharged engines — 2006-07-10
• Some engines — 2001-01-07
• Engines with oomph — 2000-12-28