Here is a simple way to build a durable, high quality, turbulator that has very low airflow resistance.
The honeycomb cell material is from Saxon Computer and is sold in 5x5 panels of hard plastic. Product description below:
Use these 1/8" cells as a fanless intake for precision control of incoming airflow. Can be used as fanless intake for CPU, video card, hard drive or chipset. Many industrial applications.
Cut to 5 x 5 inches, Larger pieces can be supplied on request.
3/4" thick (6:1 ratio) $6.99
The brass ring is made from 1" X1/32" stock sold at Ace Hardware $2.80.
The ring and the honeycomb are held together with quick-set JB Weld, the only glue-up involved.
The weight appears to be about 1/2 ounce. There is enough honeycomb left over to make at least three more.
With basic hand tools and a plumber's torch you can build this in a couple of hours. Total cost with shipping...$15.00