Yes, yes it is
Any of these things that advertise increases in power or fuel mileage for just a few dollars are basically worthless. Same with the "Tornado", the "Air Foil", the "Throttle Position Sensor" or even those magnets that wrap around the fule line. None of these things provide any more power increases than decals do.
Save your money and go for mods that do work. On a 300HP LT1 motor a 35HP increase is more than a 10% increase. That level of power increase will typically be in the very high hundereds or maybe even 4 figures to realize.