Steve, I just was on the Dodge website where the 6.7L description list showed exhaust brake as an O (option) for the exhaust brake and S (standard) for 3500. I was surprised to see that and also read somewhere else that a Dodge 2500 owner was considered having the option enabled on their 6.7L and was asking advice.
It's just like websites to show conflicting information. Here's a link that implies an option on 2500 and there are others:
http://www.dodge.com/en/2009/ram_250...ty/powertrain/
That being the case, it doesn't make any sense for anyone to purchase an exhaust brake for a new Dodge with a 6.7L from any aftermarket company. To me, getting it from the manufacturer is always better for something like this.