my 90 rex si has now cat right now b/c prev owner removed it.

what benefits would I get reinstalling one?

My car is tuned properly but smells a bit rich at times. I was debating whether or not I should change the o2 sensor on it as well to help improve performance.

thanks

 

pass smog possible better lowend no needless spewing crap into the air.

hondas cats are good parts flow really well why people remove them i'll never understand.

Alot cheaper then OEM is somthing like random tech or catco.