The 109-K4, Spit-16, KI-84, are what I call "sneaky fast". You can be in an airplane thats as fast, or faster, and stretching one out to come back at em, and instead of pulling away "they" are getting closer. The kicker is you are sure you were at equal, or a slightly better, E-state. Most of all the K-4 and spit-16 are especially sneaky fast.