[SentraSE-R]

I still haven't found an assistant. I did open the hoods and front windows of both cars, and retested their horns by holding the Nexus 7 over the exposed engines, pushing the horn switches. I expected higher dB numbers without the hoods in the way, and the N7 slightly closer to the horns.

Surprise! The wife's 2012 Hyundai Elantra produced 83 dB, and my 2006 Scion xB with Fiamm triple air horns made 86 dB. Those results were the same as (Scion), and slightly less than (Elantra) the results from the front window corners with hoods down.

Tomorrow my wife or daughter should be able to blow the horns, and I'll take measurements of my daughter's car's horns and the other two cars, from three feet in front of the grills, for comparison.

Thanks for the suggestions, Slowmover and oil pan 4. I suspect mfr/distributor claims are like most mfr acceleration claims that seem to be timed with a midget driving down an elevator shaft.