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There's a multitude or purposes. Improved power being one, improved reliability being another. Modern diesel emissions equipment fails regularly, often in hard to diagnose and repair ways.

If you spent $100k on a truck, and you could spend $2k more to 'delete' some emissions equipment to prevent $10k+ worth of repairs in the future, would you do it?

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It's not on you to decide that I get to breathe in carcinogens.

As a motorcycle rider, these people that dump black smoke when they accelerate are just pumping poison straight into my lungs. I hate it so much because there’s nothing I can do about it.

At least cars have cabin air filters. I get to suck it straight in unfiltered.

As a car driver without a cabin air filter, (are cabin air filters even effective against exhaust gases?) both diesel trucks and motorcycles require me to close my windows and vents because of the smell.

At least cars have smog equipment to reduce the emissions. Motorcycles mostly don't.

Most motorcycles made from 2017 onward have factory emissions equipment with cleanliness similar to cars (due to the Euro5 regulations from that year forward). Since most bikes have one configuration globally, even US models implemented Euro5.

You could wear an FFP2 or FFP3 mask with a valve.

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