We all know about pouring water down the cowl to check for leaks. Here's little something to try the next time you look at buying a Mustang. After you do the test and it comes out fine, park the car on an incline with the front pointed uphill and do the test again. Then turn the car around and try it with the nose pointed down. You can get different results. Do not ask me how I know this.
Variation on the standard cowl leak test
