You need to add City Diesel's Cooltwist.
Do you have a link for them?
Judging by how many have checked the "other" option you might have to revamp your list. I am still not sure what I will run but it will be bigger than the stock 1st gen one. Shadrach
The best bang for the buck is banks because it comes with intake and new tubing and ez installation.
you cant compare the cool twist with the banks system and the hi ram intake that comes with the banks system is bigger if you have the stock inter cooler now.
I think over removing the heaters, around here (Nov/April) if the sun go's down the cummins don't start.