Carbon fiber body work bolts and bonds to a steel and aluminum tubular chassis. While structural rigidity suffers by nearly 30 percent, the coupe was so strong to begin with that the Spider is a mostly body wiggle-free machine. Alfa bagged the notion of a retractable hardtop, citing high development costs, design compromises in the rear deck area, and the more coachbuilt nature of a rich looking soft top. Good call. Power is 450 horses at 7000 revs, its 354 pound feet torque peak shows up at 4750, and redline is 7500 rpm. Weight balance is 50/50.