system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why lawnmower mufflers suck

Car/Truck mufflers do amazing work muffling noise. A car is nearly silent when running with a muffler, compared to what it would sound like with open manifolds. When I fire up my Honda push mower, the whole neighborhood knows about it, and it's actually kinda quiet as mowers go. So eli5 :  Why can't lawnmower mufflers work like automotive mufflers?
gpt
Well a car muffler is about 100x larger. That's why. The sound bounces around way longer before exiting the muffler. If you attached a larger muffler on a mower it would be quieter, but it would also be more expensive and  much heavier to push around.