I've got an 06 2500. Do I have a cabin air filter? If so where is it and how do I change it?

 

Unfortunately,they do not have cabin air filters.

 

Is there anything that restricts flow? my 05 doesnt seem to blow very hard.

 

You probably have a Blend Door issue like so many others have. Do a search on that. You will have hours of reading hoffdog....

Genosgarage.com sells a cabin filter setup. Most guys agree that it looks kind of crappy because of how it mounts on top of your cowl vents...

 

Or you could have a recirculation door problem. I have that now. There is a post that addresses this and will tell you all about it.
Here's the link. https://www.dieseltruckresource.com/...ight=vent+door