Anybody install Dynatech's headers on thier 03+ Expy? The closest app looks like 122-622100s, the`04 -`05 Ford F-150 4WD Truck (5.4L) 3 Valve Header System.

Alternatively, anybody know what the differences are between the factory exhaust systems on the later body style F-150 and Expy?

Thanks,
K.