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Our C4 Corvette Automatic Shift Improver Kits are the easiest way to get the stout performance you've always wanted from your Automatic Transmission equipped C4 Corvette. Manufactured by B&M each Shift Improver Kit includes two modes of performance to select from: Heavy Duty, or Street/Strip. In an afternoon, you can turn your transmission into a B&M-tuned unit! Best of all, you don't even have to remove the transmission.