The New Boss 302 Intake - Hot Rod Magazine 2012 Boss 302 Intake Test - 5.0 Mustang & Super Fords Magazine
Proof? Link please.
So, even if true, we're talking over $100 per HP. That's about the worst bang for buck possible. Thanks for the heads up randeez11, those are two very valuable cents.
These are just two examples of the many articles out there. Use Google and you'll find some more.
As stated, you'll get some gains from these...but at quite the cost.