You will find that until your setting is at the desired pressure, you can open your mouth to breathe out as you inhale through your nose deeply because you feel like your suffocating. Once you reach the higher pressure, opening your mouth will cause air going in your nose to vacate your mouth. This is why it needs to remain shut. People go as far a taping it shut. I just couldn't get used to it. Good luck bud. I look forward to the update.
Oh yeah, when I hit about 10.6 psi it's gets tough. I wear a mouth piece to keep my mouth closed. Works really well .
