I had my (uncoated) PPE downpipes installed by a local exhaust shop, and the tech said that he had to move a rubber mount out of the way to prevent contact. When I changed my oil a couple of weeks ago, I saw what he was talking about, and it didn't appear to be a problem. I just got my catback system today, so I'll check it again when I install it. I'm very happy with my PPE downpipes. Can't wait to try them with the catback.