It's amazing that there are like 7 or 8 answers with different information, so I'm going to add another.
- MagneRide comes on both packages, tech and track, it just doesn't come on the standard car in '15 or '16, but it is standard in '17.
- All GT350's have the strut tower brace, standard and tech have a steel brace, track and R have an aluminum brace, the track package is an aluminum brace and not steel.
- The Recaro seats are the standard seats in the GT350 and the heated and cooled leather trimmed seats are the only optional seats, the Recaro's are not optional, they are standard on all three years '15-'17.