In most cases, a car with a bigger engine will cost more to insure than a car with a small engine. A bigger engine is often more powerful and therefore the car will be faster. This is deemed as riskier for the insurer to cover. As previously mentioned, turbocharging increases the performance of even the smallest engines, so insurers will also take this into account – a 1.0-litre turbocharged engine is likely to put a car into a higher insurance group than a 1.0-litre without a turbocharger.