Originally Posted by Buzzman
If it was an up pipe leak wouldn't the leak be present at all times? The 'leak' seems to occur after 15 minutes of driving.
An up pipe leak likely becomes loud or plays like a trumpet as you build boost. (the pressure hits the up-collector connection and the leak either acts as a whistle or the gasket acts as a reed "making music". LOL
My up leak was really bad and when I got on it I could feel it depressuring as the 5 year old kid practiced their trumpet lessons
A fart or duck would likely be under the tmic... Etc. Different leaks often make different sorts of noises.