Exhaust question

I have a 2010 tundra 2 owners including myself. The previous owner had one of the rear cats removed just one on the passengers side. I have no codes but it is really loud especially from the side missing a cat. Is this ok for the engine to have 2 cats on the driver side and only one on the passenger side or should I also remove the rear cat from the other side.

 

It doesn’t hurt anything to have it like that. However, it’s odd that it’s loud from just that one side. My question would be why? Do you have an aftermarket exhaust system? Or is there a huge leak?

 

It's not uncommon for folks to pull both rear cats altogether and still not see a code

 

If there are no O2 sensors downstream of the second set of cats it won't throw a code. Comparing the upstream and downstrean O2 signals is how the ECU determines if there is a cat efficiency issue.