Your buddy is right. The C5 turbo kit is more expensive than other cars, but not just because of the turbo. The bargain price for a twin-turbo kit is around $2,000, with most other kits averaging $8,000 - $14,000.
However, modifying a car for more speed impacts the rest of the engine and body of the car, so you may need to make additional adjustments. An updated engine management system, fuel system, and new tires may be required to keep your Corvette in good condition.
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