are intake spacers bs?

[stangt00]

Steeda sells a machined aluminum spacer which they dyno tested (supposedly)

One of the simplest ways to gain 2 - 7 RWHP on your 96-03 4.6 Mustang is the intake spacer from Steeda Auto Sports. This easy to install and cost effective piece works, we dyno tested it on both naturally aspirated and super charged cars! We gained 2 - 3 RWHP on naturally aspirated cars and 4 - 7 RWHP on super charged cars. For just $79.95 you can't miss this simple power gain. The high quality CNC machined piece comes complete with gasket and hardware.

I bought a phenolic one off of E-Bay for $30. Difference being, aluminum soaks up heat and transfers it to the air coming into the intake, phenolic does not. Hell, if I payed $30 for 2 rwhp then its the cheapest power I picked up yet. No dyno #'s though. Is'nt that always the case