There's a foam bit that seals the top of the brake duct. There is also a template marking exactly where to cut the brake duct (but there is also another template, so you have to be sure you are cutting out the correct one). I cut mine with a Dremmel and the little metal burr drum. It cut it like butter, and I was able to 'stay in the lines' better than trying to cut it. It's not a round hole by the way, it's a bit of an oval. |