Just finished installing some Dynomax headers on my rig. Took me and by buddy about three hours total. Headers fit real nice. Spent some time wrestling with the A/C compressor brackets and power steering bracket, but no real issues with the install. Pretty simple deal. Truck sounds really sweet. I was impressed with the quality of the headers. We'll see how they do long term. One question though, the wiring to the starter is extremely close to one of the primaries. Have you guys with headers wrapped these wires with insulating material? It seems like these would melt pretty quickly under operating temps.