A P-40 with E is very dangerous. A P-40 without E is dead. Low-speed handling is mushy, with insufficient power to get it moving. Requires a lot of rudder to avoid snap-rolling out of turns when at the limit. However, such rudder use only bleeds E faster.
High-speed handling is excellent. Don't let speed bleed below 200 mph and you'll find that it turns very well. Use flaps only when needed, and only for brief periods, unless you are in a one on one with no other baddies nearby. In that case, you can dump flaps and maneuver as needed. If there are other baddies nearby, avoid getting it too slow as you are at extreme risk. Hard turning close to the ground without flaps presents the risk of an unwanted snap-roll. If you lack enough altitude to recover, you will auger. P-40s can be very unforgiving at the limits.
My regards,
Widewing