I bought two OEM exhaust shrouds. The Aluminum one that is installed right over the flex ball and socket spring unit, was cut in half, flipped upside down and slid up and over the upper one. Then attached with stainless steel hose clamps. The large appature end was wrapped in the same manner up under the flex joint. It also was attached in the same manner. Ahead of the aluminum one is a steel one that fit around the O2 sensor. I bought a second one of these and press fit them both together. Used a drill to open the holes slightly in the second, and installed with a hose clamp around both just in case vibration became an issue. It has worked well for me as far as heat goes.