It all depends on what application and the emissions standards they need to meet with that particular vehicle. Since Ford's portfolio has shifted to trucks and SUVs along with emissions standards getting tighter and tighter, expect to see EGR popping up on most Ford engines in the near future...
Need a favor from a stock Cobra owner:
We are verifying some suspension points we have recorded for the 2004 cobra and are looking for the distance between the cradle and the ground plan on a stock ride height Cobra with stock wheels. If anyone has a car on a 4 post hoist this should be a quick...