If you want it, it's worth whatever you're willing to pay for it. There are other intakes that flow more at peak, but peak flow isn't the only thing worth considering on an intake purchase for a street car. How the flow is distributed between the runners, average flows (which take low rpm performance into consideration too) are also helpful in making a choice. While the GT40 upper can be Extrude Honed (expensive) to some degree, the fact that it can't be ported in the traditional sense isn't so much of an issue - it's the lower that is the flow restriction, and it can be ported. The only thing that hasn't been mentioned is that the GT40 is the lightest manifold out there -- saving you about 9 lbs. over all the other cast uppers. The Cobra, GT40 and Explorer all share the same lower intake - it's the uppers that are different. They are decent flowing intakes that will support the milder mods that are made to the majority of 5.0's out there. As others said, the other aftermarket intakes flow a bit more at peak - but that's only an issue if you've got enough motor to overwhelm the intake's flow limits.