I got the Ebay ones myself...also did a bigass write-up with plenty of pics, install info, actual pipe measurements, etc...
Ebay/OBX style header install w/plenty of PICS (LONG, but detailed) - PerformanceTrucks.net Forums
I'm very pleased with them for the money I paid.
Here's what they look like after 2,800 hard miles with plenty of road salt and moisture from rain and snow, not to mention 6 days a week into and through a steel mill:
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