Alright i finally got the old dp off with some air tools and have the new one on. only problem is, when i accelerate quickly or floor it, there is a slight hissing noise. My first though is, i have a leak. i took it to an exhaust shop in town and they said they could not find a leak what so ever. Maybe it's such a slight leak that only leaks when there is a lot of exhaust traveling through at once? Maybe the sound is normal? I'd like to hear what you guys think.