* Modifications: Many cars are modified to be louder than their factory settings. A stock car will be significantly quieter than one with aftermarket exhaust systems, removed mufflers, etc.
* Measurement methods: How loudness is measured impacts the results. Different tests use different methodologies and units (dB, dB(A), etc.).
* Legal restrictions: Laws and regulations vary globally, making it difficult to create a universally accepted "loudest" list. Cars exceeding legal noise limits are often illegal to operate on public roads.
While some incredibly loud modified cars exist, claiming one specific model is the absolute loudest is inaccurate and misleading. Many custom builds push the boundaries of sound, often exceeding safe and legal limits. The focus is often on achieving extreme loudness, rather than on any official, standardized measurement.
