I recently did the mod with the maxijet, tried it with and without the 4$ part.... I am in favor of without- however, I will post my final opinion on how to do this "just so" later today or tomorrow. I am shooting for a high amount of contact time, with low noise... Kep an eye out for that cpr thread, I will update it soon.
Search the boards- emilyb posted some pics of the mod in above mentioned thread.
Installing my rena air pump to assist, shortly....
Could someone please show a photo of the maxi jet on their bac pac with only the airline pushed into the intake. I have tried this but the screen on the powerhead won't let the airline tubing stay in place. Maybe i am doing something wrong.