I would say... not restrictive. The entire base is an open cavity rather than a 3" tube making a 90 degree turn. Also the inside of snorkel is glossy smooth to promote better airflow.
I'm more concerned with the heavy duty wire twisted hose that goes through the fender. Seems like that could mess up the airflow a bit. Check out the pic of the Rodeo I posted and you'll see the hose on top of the engine.
I really want to keep my ram air cone filter setup but I need to find an enclosure to seal it. I'll report on the performance changes once I get everything hooked up.