[JamesM3M5]

Hell, I'd think 80-90% at peak boost? Maybe 100% for very brief periods? It would definitely depend on levels of modification. Stock everything means higher WGDC to achieve/hold the same boost as a car with intake and exhaust mods. Problem is achieving and holding 1, 2, 5, 10, 15 psi and checking via logging. It would require several users to undergo the same test procedures and report findings, and even then, improper technique and other factors would muddle the results.