Ford's legendary Sierra and Escort RS Cosworths changed the face of performance road cars, making them as desirable to keen drivers as they are to classic collectors. This quick-reference guide acts as a handy pocket-sized companion during the purchasing process. It aims to help buyers select the best car, pay the right price, and avoid the potential pitfalls. This one-stop package of great advice includes at-a-glance tips, illustrated in-depth inspection guidance, specifications, notes on modifications, and real-world cost considerations.