George, I wouldn't be surprised is there isn't an Si specific owner's manual. Si owners were probably supplied with a GT5-S manual and an Si addendum.
Just for fun, here are the alignment specs for the Ferrari F40, which was also developed in the '80's, has similar suspension technology and tire sizes.
Camber: -1°10' to -1°30' (front)
-1° to -1°20' (rear)
Toe-in: 1.5mm to 2.5mm (front)
2.5mm to 3.5mm (rear)
Caster: 5°10' to 5°20' (front)
Tire Pressures: Normal Use: 41 psi (f) 36 psi(r)
(Pirelli P-Zeros) High Speed Use: 44 psi (f&r)
With Bridgestones: 36 psi (f&r)
With Goodyears: 36 psi (f&r)
With Michelins: 41 psi (f&r)
Tire Sizes: 245/40-17 front (note: Goodyear & Michelin use 235/45-17 front)
335/35-17 rear
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