muhammadc

But there's no such thing as an S4 Plus! There is an S4 4.2, as well as a S6 4.2... not all S6 4.2 are S6 Plus. There was a base S6 with the 4.2L V8, with 290HP, then the S6 Plus with 326HP and other S6 Plus-only upgrades.

I'm pretty sure the lineup goes like this:

S4 Sedan 5-speed 2.2L I5T 227HP
S4 Avant 5-speed 2.2L I5T 227HP
S4 Sedan 6-speed 4.2L NA V8 280HP
S4 Avant 6-speed 4.2L NA V8 280HP

S6 Sedan 5-speed 2.2L I5T 227HP
S6 Avant 5-speed 2.2L I5T 227HP
S6 Sedan 6-Speed 4.2L V8 290HP
S6 Avant 6-Speed 4.2L V8 290HP
S6 Sedan 4-speed Auto 4.2L V8 290HP
S6 Avant 4-speed Auto 4.2L V8 290HP
S6 Plus Sedan 6-speed 4.2L V8 326HP
S6 Plus Avant 6-speed 4.2L V8 326HP

[Jimmy is welcome to correct any errors in the info. ]