Car carbon capture to retrofit existing cars is this idea in my head that refuses to go away. Barriers: what to do with extra CO2, parasitic load, lost storage

Car carbon capture to retrofit existing cars is this idea in my head that refuses to go away. Barriers: what to do with extra CO2, parasitic load, lost storage space. But if the result is zero emissions and I can pay, I dunno, $1000 and drop my fuel efficiency by 20%, I may go for it.