Catch can? Do you have to?
Does your can look like this?

AN fittings are not a necessity, and if you got a boosted can you should not have any pressure in the system. After all that is the entire point of it. Unless the relief valve is stuck (that would be a first) there really is no way for it to malfunction.
Care to share a pic of the install to me?
Hopefully anyone that has any questions about these knows how to contact me.
your 'tuner' has defeated the factory pcv system with his breather, and all associated beneifits and wants to up-sell you to modifying your valve covers.
for the most extreme cases of crank case pressure i also offer an adapter solution to mount my boosted valve to the oil fill tube (but like the one on my cans, it is exit-only, so you retain stock-like pcv function)
The Best V8 Stories One Small Block at Time
I have my valve covers baffled, before I did that I would get some speckles on my bumper since it was a open hole out the cover right over top a rocker
Now there is nothing what so ever.
It works just fine with the front cutout open too. I have zero sign of high crank pressure, no oil leaks at all
The -12 braided slips right onto the check valves
Small diameter pipe so there is always high velocity of gas through it
But under load the cutout keeps high pressure from building in the the exhaust but still leaves a good velocity of gas through it
It is strange, even with the front dump open at idle there is a lot of exhaust flow through the full length exhaust








