[Pothole]

What year is your t5, the pre facelift used different clips and the tabs on the pipes have a habit of wearing and slipping past the clips. Common locations I have found are the one rubber hose nearest the Turbo, the one that exits the inter cooler and the plastic connection after the first pipe on the exit of the inter cooler. Slight leak and mine would make a hissing noise but when a more visible gap was seen then I’d get black smoke out of the exhaust