The Mac Headers are by far the most expensive modification that I have made to me Z so far. They were also about the best bang for the buck. I took a few comparison shots of the headers, the exhaust manifolds, and the Y-pipes. I decided to wrap them with Thermo Tec header wrap and it does help reduce the under hood heat. Installation was not to bad, took about 4 hours to tear everything down and another 4 to put it back together. I capped the air injection ports with an oil drain plug. I also installed a set of MSD Super Conductor spark plug wires, routed under the headers. With the header wrap they are safe from any heat damage.