My notes from almost 20 years ago taken from Porsche documentation. The '97 to '98 change was:
18” wheel option with rear chassis reinforced to accept new wheels. Rear body structural change included redesigned wheel wells and coil spring mounts, lower engine compartment bulkhead, rear wall cross member and rear axle mount reinforcements.
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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