**** yeah man I absolutely encourage you to see how far you can go with the build! The more people getting after it the better!
I get what you’re thinking, but the factory breather cap itself isn’t flawed or undersized. It’s designed to vent air only at the correct fill level, and under normal conditions it should stay dry. Seeing light vapor over time can happen, but if there’s noticeable oil residue at the cap, that’s usually a sign of aeration or pressure and a good indicator that the fluid needs to be changed — not that the vent needs to be modified.
At the end of the day it’s your call. I’d just hate to see you add an extended vent and end up chasing the same issue again. Running the factory cap and staying on top of fluid changes has worked well for me without any issues, so it’s at least one example of effective preventative maintenance to keep in mind.
@aaron240 makes the Billet PTU brace with heat shield. If you send him a DM I’m sure he can fill you in on more details. I’ll give him a heads up to monitor his account here.