dude.... that is not nos i'm talking about!!!
sif nos is in the exhaust c'mon
if nos is used at idle... there won't be much of the engine left.. i've seen this happen a couple of times
with regards to wrc cars.. it's their tuning with antilag, but cars on the street that have it.. do as i described, you can leave it on or off... leave it on you will constantly get the flames