I like them but, without a performance boost, and just cosmetics.....meh.
I guess this proves adding those outside air intakes like the Hellcats to a 392 makes no power difference either.
IMHO, I would prefer a retro anniversary edition, with cool orange retro style intake systems, decals, etc and other stuff....including performance to go along with the different looks.
The power ratings for the engines are done in dyno cells on an engine stand, not in the vehicle. So whatever intake system / exhaust system in that vehicles engine/drivetrain/emission system application is used in the test.
-FCA wouldn't submit all these variations (T/A CAI system, Shaker CAI system, Hellcat Air Catcher, or Demon Air Grabber) for certs and testing - its expensive and probably yields the same net result, since these are not in-vehicle test procedures.
Here's an excerpt of the SAE test procedure and correction factor references values.
Table 2 defines reference atmospheric conditions and test ranges for which correction factors are valid.
TABLE 2—REFERENCE ATMOSPHERIC CONDITIONS
Standard Condition / Test Range Limits
Inlet Air Supply Pressure (absolute) 100 kPa —
Dry Air Pressure (absolute) 99 kPa / 90-105 kPa
Inlet Air Supply Temperature 25 °C / 15-35 °C
The aftermarket claims for their products - its highly subjective and results vary, as we've seen in the real-world.