With the LP400S, which replaced the LP400 in 1978, the Countach became even more aggressive, at least as far as aesthetics were concerned. At the customer's request it was also possible to mount a striking rear spoiler. At an engine level, the power dropped from 375 to 353 horsepower, to meet all anti-pollution regulations. Lamborghini was unable to develop specific engines for markets with complex anti-pollution requirements such as the American one. Production of the LP400S continued until 1982.