Rawze.com: Rawze's ISX Technical Discussion and more

If Volvo are so bad for airflow to engine bay I wonder about some other models? Such as Columbia, Mack vision slope hood, IH 9400, the cascadia 112 seems like a wannabe cab over. And the century trucks. These seem just as bad as the Volvo.

My full size Cascadia seems to pump out a lot of heat from the rear of the hood in front of the doors. So I assume it's moving air pretty good.