i've used catch cans in the past on modified cars, my last a VW GTI (400whp, double stock) i played with a few. Some augmented the factory PVC and didn't pick up much, some replaced, but really just collected what the PCV would have handled well. I've seen issues when the can is too full or freezes, I haven't really seen a case for it on stock direct injected vehicles. even with the can you will still need walnut blasting at regular intervals. Some vehicles have an additional injector for the intake supply to clean valves, im not sure if we have that. Alternatively you could fit a water methanol system and keep the valves relatively clean