Why is it again they have two?

'Cause nobody makes single engines with that much power.

Of course you're ruling out turboprop singles, right George? : )

I was amused by the original post quoting FAA records saying the Navajo
had a 160mph cruise speed. My pal's PA-31 has no problem maintaining
180kt in cruise, or around 200mph. Feds.... Sheeesh...