no I did not change the butterfly. I just taper the inside up to it.
I took everything off that I could, and took a wire brush to it to clean off as much of the oxidation as possible. I then actually cleaned it in my sink with dawn dish soap, it will take the grease out of your way lol. Once its dried I started with some light coats to build a good base from, and kept going from there. The paint is very thick on there almost like glass. Once I was satisfied with the paint, I gave it three coats of clear coating. I also clear coated the exterior of the sensors for the deep black look.