First off, I know very little about physics and have only taken classes in high school years ago. I'm a car fanatic and I'm mainly joining this forum to settle a debate I'm having with one of my friends about turbo cars and boost leak tests. For those who don't know, in an automotive turbocharged system the turbo spins and compresses fresh air into the cars intake tract creating boost allowing the engine to create more power. Part of the maintenance of these cars is something called a boost leak test. A boost leak test is where you seal the intake tract and apply air pressure equal to the amount of boost your car will produce under operating conditions and then look for leaks. Any leaks found equate to loss of power and can throw off the tune of the engine, so it's important to find and fix all leaks. My friend thinks that a leak found during a boost leak test will leak the exact same amount of air as it would under the same boost pressure with the car running at operating conditions. I think the turbulence and higher volume of air seen at operating conditions will cause more air to escape the tract than a static test, even if the air pressures are equal. I hope this makes sense and I've posted this in the correct place. Basically we're wondering if compressed dynamic air will leak out of a pipe faster than static compressed air, if both are at the same PSI.