ack, ECU got his post in b-4 mine.
i was agreeing with nordic
even if the airtrap is the highest point, there are, as you said, other 'high points' (could be the top of the rad, WB, tubing, etc). so having the airtrap @ the top is a moot point, as long as water goes into the airtrap, air will settle in there. to get ALL air out of the components (core, WB), you'll need to play with them just the same as you would with an inline system (that is, one with no res / airtrap).
think about it...... *ouch* lol, dont think too hard thought, might hurt yourself
