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Between $1,000 and $6,000.
Unfortunately your question is too broad, you need to narrow the scope to get a better answer.
e.g.
Simple roll bar, 2 point, bolt in or weld in
Rear roll cage, 4 point, bolt in or weld in
Front and rear, 6 point
F, R and suspension mounting points
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86 911 Race Car, with a few 993 bits in the boiler room
79 928 Race Car
88 928 Becoming a Race Car
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