Jan Stefan Sören "Flash" Nilsson[1] (born 15 December 1960) is a Swedish former race car driver.

He became the Swedish F3 champion in 1989[3] and drove Formula 3 in Japan and Mexico before moving to Clio Cup Scandinavia.

Flash Engineering signed on several new sponsors, the Swedish mailservice "Posten"[9] among others, for 2006 and dramatically increased their available funds.

They also signed on double Swedish champion Richard Göransson and former Flash Engineering Volvo driver Edward Sandström.

For 2006 he focused on STCC and his spot was filled by reigning champion Fredrik Ros in Carrera Cup.