This traditional tuning philosophy argues that building a larger-capacity engine yields more usable torque than adding complex bolt-on power adders to a small block. By increasing the bore or stroke, a motor naturally ingests more air and fuel per cycle, generating massive low-end power without the lag or heat issues associated with turbochargers. While high-tech forced induction challenges this rule, it remains a core belief among muscle car builders and drag racers.
You can strap all the turbos you want to that four-cylinder, but at the end of the day, there's no replacement for displacement.
Although high-boost turbochargers extract massive horsepower from small engines, old-school builders still quote this when a highly stressed four-cylinder blows a head gasket trying to keep up with a big V8.