I am currently using a Viair 380-C and a 280-P to fill a 7 gallon air tank in My Honda. I gave my Other Viair 380-C to my dad for the horns on his Honda. It fills up his 5 Gallon air tank like the day it was new. I am running both air systems at 120 Psi. These things are beasts, and have seen quite a bit of abuse. The only thing I have not done was Run them without my engine running.
Im in the same boat with my Viair 444c’s 9 years running strong!