All three cars have been heavily modified – or so the Youtuber who organized the quarter-mile event claims. Sadly, due to an editing error, the specs for the RX-7 have been lost in translation, so don't take the video for granted.
The Mazda sports the 1.3-liter rotary engine – the free-breather model, not the turbocharged version. Not that it would have made too much of a difference, as neither variant goes beyond 200 hp. Nowhere near the alleged 500 whp, as you can deduce by the race results.
However, because it is a daily driver, it has the complete interior and air conditioning and carries its spare tire. That's probably why it didn't beat the BMW in a head-to-head clash – but it could also be that got frightened by the slippery Bimmer during the warm-up rolling race.
The yellow M3 went a little sideways and cut off the Nissan, and that's why the races run eliminator-style, to avoid potential metal-against-metal incidents. It is irrelevant whether the 520-whp output of the 3.2-liter inline-six BMW was to blame for the zig-zagging warm-up. The critical detail here is the 11.8-second quarter-mile time recorded by the turbo M3.
The 2JZ-powered Nissan 240SX put up a better fight than the Mazda, scoring 12.3 seconds on the quarter-mile sprint. It hit 60 mph (97 kph) just three-tenths of a second behind the BMW M3 (4.8 versus 4.5), while the RX-7 only managed 6.9 seconds.