[scarby2]

the requirement for the STC on a per-aircraft basis is now gone AFAIK. That was the effect of the FAA's "legalization" last year.

[sokoloff]

You still have to purchase the STC for your airplane serial number and engine(s) serial number. What the FAA did was approve that all-model STC as being valid/legal to sell and "install" (which is just placards).