[peachz33]

gatherd that basic red flames is jst back pressure/unburnt fuel ... but im hopeless

[negativecamber]

i think brian had the blue flames and souki's was more of a pink than red.

[Entice]

I remember from science in High School that things like gas burn blue when they are really hot and orange/red when they aren't AS hot. Don't know if that translates to this or not haha.

[ChuckP]

Blue is when you activate the NOS red is no NOS, im pretty sure brian had NOS, 2 bottles infact, 2 of the big ones if I recall correctly

[5ky-lin3]

I think youll find in the case of '2 fast 2 furious' Brians skyline did have 3 bottles of NOS but none were actually connected up. It is more likely that the car was fitted with a NOS purge kit which also can be supplied with an LED light to shine the purges the desired colours (with Brian Blue). In the movie we can also see the purge kit used for the huge purges sideways out from the car when he is arriving at the first race.