Before changing the ATF on the Maxima, I'm thinking of installing a transmission fluid cooler. The best place to mount it seems to be in front of the AC radiator using brackets I'll painfully be making. I'm leaning towards using one of the Haydens: 401, 402, 403, 676 or 678. The Maxima is cramped. Now the first question: would mounting the radiator with the barbs pointing towards the ground result in air pockets inside the radiator? All the photos I've found show the filter mounted with the barbs to the side. Mounting it with the barbs downwards would make for shorter hoses. Second/third questions: do you think the 678 is too big for this application? Are the 676 and 401 too small? A long, narrow radiator (401, 402) installed behind the grille would maximize airflow, while a 678 would be halfway hidden behind the bumper (with somewhat reduced airflow in my mind). I don't have a tow hitch on this car and I will most likely keep it this way. It will be used for commuting in rush hour traffic, trips to the mountains (12-24 per year) from sea level to 6k-10k ft. Thanks for reading.