Join Date: Aug 2011
Location: Albuquerque, NM
Ferrari Life Posts: 11,881
There was no claimed hp difference despite the different, and one-off, firing order. Ferrari used the same firing order used since the 125 on all the other street V12s except the 456M.
Airbags or not depends on country of delivery. All US spec 456s, 2.7 and 5.2, were equipped with airbags. So it does not appear 2.7 and 5.2 were the only criteria. Which other countries were airbag equipped, no clue.
Download owners manuals and a 456 workshop manual from ferraridatabase.com and see if you can puzzle out the answer yourself.
Present: 575M 135171
Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125
Every day I look around, and if nobody is shooting at me, it is a pretty good day.