Testing the HORSEPOWER: valet mode, black key, and RED KEY!!! Updated on By Wes Comments Off on Testing the HORSEPOWER: valet mode, black key, and RED KEY!!! Republished by Blog Post Promoter Republished by Blog Post Promoter Tweet By Wes You May Also Like 1973 Buick Century Gran Sport GS Stage 1 in Gold & 455 Engine Sound History/Breakdown: 1965 Chevrolet Malibu SS 396 Z16