Will hella 002768821 24v horns to a dc36v/48v battery using a dc24v20a 480w step down transformer be the correct amps and watts for these horns?

Transformers only work with AC not DC. You could use a voltage regulator or a series resistor to reduce the applied voltage to 24V. Or, with 48 volts DC you could just wire them in series so that they each get only 24 volts. The current (amps) will take care of itself (I=V/R), about 5 Amps, I'm told.

Will this fit a 2016 subaru legacy? please only yes or no. no shoulds.

This isn't a yes/no question. It'll fit any car so long as you can find a proper place on the frame to mount them. Mine came with only one high-tone horn. I had to find a place to mount the second. Look at videos of others doing it. You may need to drill, and you'll need to run one wire only as the negative runs through the frame.

why are there two ? can i just install one?

Some vehicles are outfitted with two of these, like my SUV. Yes, you could install just one, but I find myself wondering why you don't just by a single horn?

Brand	Hella
Style	Safety
Noise Level	113 Decibels
OEM Part Number	002 768-821, 3AM 002 768-821, 56370045, A100-323, S92 SET
Automotive Fit Type	Universal Fit
Manufacturer	HELLA
Global Trade Identification Number	04082300558906
Item model number	002768821
Manufacturer Part Number	002768821
Position	Front
Assembly Required	No
Country of Origin	USA
Item Weight	490 g

HELLA 002768821 Black 92mm 24V Disc Horn Kit (Universal Fit)

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