the temp has mayor roll to play, if it drop significally and to me that will be 15-20 deg the car is going to foul up, hot HP requires colder plugs for turbos to avoid leaning out top but when the temps drop 15-20 deg you ned to remap for fuel delivery or it will run way to rich, and can cuase the plenum to go belly up don't ask me how I now this. still hope this goes down soon.