Until I see hard data showing otherwise, I don't believe running a catch can causes back pressure in the crankcase as long as the catch can isn't undersized. Catch cans are not restrictive if they are properly sized. I've spent hundreds of hours on motors testing crankcase vacuum and pressure on high performance motors and have never seen the slightest hint of pressure caused by a catch can.
The key is, again, making sure you are using the correct size catch can/fittings. make sure the catch can fitting size matches or is greater than the CCV outlet and you won't have an issue.
Some will argue that, by the factory running the CCV into the intake, these motors need vacuum. The reason they run it into the intake is simply for emissions. Keeping oil vapors from being released to the atmosphere was the intention.