system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do motorcycles sound louder than cars?

I thought they had smaller engines but they tend to be more noticeable.
gpt
Not all of them do, it depends on whether they have a useful muffler or just a chromed tailpipe on them.  lot of motorcycle owners like the noise so the manufacturers use a minimally restrictive muffler on them. Most car buyers prefer them quiet so manufacturers engineer the muffler to eliminate noise. 

 Sometimes the opposite is true. A lot of big cruiser type bikes are real quiet and a lot of car and truck buyers purchase less restrictive aftermarket mufflers to make them noisier.