Flame Job. The photographer tried for decades to capture an exhaust belch like this. It finally happened with this Lola at the Sebring hairpin in 2004. (But the darn brakes aren't glowing...) The picture shows that a strobe doesn't necessarily blot out a well-illuminated background.
Photo: Pete Lyons - www.petelyons.com
I think one reason is, darkness adds another dimension to the defiance. Motor racing has a deliciously illicit taste even in daylight, and doing it after sundown seems sinful.