Ok I'll try..
And what I'm saying, is that Ford wouldn't have spent man hours, and money redesigning the upper intakes if there wasn't a gain as a result. Obviously, Ford realized that the upper intakes on pre 98 3.0's were a restriction, and could be improved upon. Thats why they made an entirely different upper intake for the newer trucks.
RESTRICTIVE is a code word the aftermarket guys use. THEY are trying to make the gullible public THINK Ford, and others, have spent millions of engineering hours and designed RESTRICTIVE intakes, (among other things).
So we see changes in the Ford intakes and we THINK the one being replaced was "restrictive"..
There could be many reasons Ford has changed from this intake to that intake. COST could be one reason. Underhood shape and use, could be another.
So you ask, why are the runners longer? Perhaps it could be as simple as NOISE eminating from the intake... or even limitations in the manufacturing of that product.. But we do know for sure one thing... It wasn't because the older one was "restrictive".
New and different mean just that! New and different don't mean "less restrictive"..
And always remember if the old one was restricting the flow to the cylinder, and the new one doesn't..the engine will be in one whole hell of a lot of trouble with the less restrictive one installed.. Because the old engine was designed around the amount of fuel in the cylinder.. If the new one allows MORE fuel into the cylinder..bad things begin to happen.
On the other hand if one was building an engine that was to be used at 7, 8, or even 9,000 rpm, he would build that engine around completely different components than the stock ones. As at them rpm the stock components would prove to be "restrictive".
Big JIm

