The gunship stage 1 is fantastic, i had one on a 4x4 that had done 145000 miles, it was so quick, i think it is quicker than most stage 3's because it is mapped so well where as others are not as good mapped, i can say it was quicker than any stage 3 mapped cars i had!!!! As said the theory is put larger injectors in and yes get more power longer, but you need to know how to map the way mr norris does, he is a genius and can make a stage one quicker than other tuners stage 3's!