Catch cans do virtually nothing on port injection engines like the Hemi. The vast majority of the blow-by they catch would be washed into the cylinder by the fuel injector and burned. I know it makes you feel good when you empty it, but stopping 100 ml of blow-by, give or take, between oil changes every 5000 miles is stopping like 6 ml of blow-by from getting in your intake on every tank of gas (considering you will burn about 17 tanks of gas between oil changes, give or take). And keep in mind that of these 6 ml, in the most pessimistic estimation ever, 50% (but I think it's actually like 90% or even more) is basically washed into the cylinder to get burned. Catch cans are needed on direct injection engines because the fuel injector can't wash the blow-by from the intake valve and it ends up creating carbon deposits. And you hear about blow-by reducing the fuel's octane rate a lot: come on, 6 ml (or 10, or 20 ml are a drop in the ocean for 26 gallons.