Im planning on trading YM on ECBOT, i notice it doesnt have native stop or stop limits like the globex instruments which i also trade. I will initially be starting with 5 lots and working my way up. How much slippage can I expect to get trading a mechanical system which will be using IB simulated stop limits for entry and exit (one or two entries per day). With globex native stop orders i rarely get slippage, probably once every 5 or 10 trades. I will only be trading in normal trading hours and i will be using stop limits to avoid getting hit by those 50-150 pt spikes that happened last month. (My limit will be about 30 pips from the stop).