i just ordered the 21lb moroso cap works great so far no leaks, I was not leaking before but did it as preventative... eastcostjeepsrt did a vlog on youtube suggesting guys running higher boost get one. Mine works good so far no issues.
OEM 21 psi, have installed 3 radiator caps in 50K miles for my 2014 Chrysler SRT, have had to add coolant not many times to maintain proper level (pressurized over flow tank). My son always tells me he can smell coolant. Dealer has pressure tested system and always said cap is bad, I've tested caps before with tester they come close to 21 psi. No signs of any leaks so I just keep getting new caps if I have to add coolant more than 2 times. I've other vehicles that I have never replaced cap.