[Woodz428]

It's pretty common knowledge that uncoated headers do fail after using heatwrap. Haven't heard the head concern before but I would doubt it. That may be if the headers deteriorated and were left that way, creating a hole and possible lean condition on a cylinder or 2. I haven't heard anything but speculation on the HPC coated headers. Since they were introduced at a time when header coating was still fairly rare, the standard header issue has been long known. You obviously have a Roush engine, ours doesn't generate much heat but the Roush engine one we did had heat waves in the video we made of it on fire up. It isn't a noticeable thing on ours, but they were very vivid with the Roush 402. HP equates heat. The reversing of the lower fans was a good move,with them the other way they tended to keep the fan sensor under the passenger header hot all the time. Drawing cold air up and exiting it through the top allows the sensor to cool down instead of gain heat when it kicks on.