Depends on your thrust:mass ratio and server speed limit. Generally, I don't have a problem outrunning Alpha station missiles at 100% overdrive. I'm not sure of the speed, though. But I did leave the missiles in the dust, so you probably need about 300 m/s to out run them.
Nah, it depends on what type of missiles wants a piece of you, unles the admin changed the weapons multiplications, every weapons projectile speed is based on the speed limit.
So say for the sake of simplicity, 100ms would be the limit, 200ms with 100% overdrive, that would mean the following missile speeds:
Missile+0% Slave = 198ms
Missile+100% Cannon = 198ms
Missile+100% Missile = 99ms
Missile+100% Beam = 396ms
Missile+100% Pulse = 66ms (Alpha Station uses those if i remember right)
Now, pretty much everybody and their mother, heck even me, use Missile+Beam most of the time, good luck outrunning that.
And everybody who knows a good deal about missile weapons, wont build heat seekers with 100% slave, but rather with various lower slave ratios as low as even 0%, so you would need a good Overdrive ratio to outrun them.