What you read is that if you have an 01 or newer car, the computer will keep testing for a rear O2 sensor by dumping a ton of fuel into the engine. So you want to put that defouler in place asap.

I'd like to suggest that you understand the ramification of mods you plan in the future, while we answer a lot of the same questions day after day, I'd much rather see a guy ask a ton of the same questions than make the same mistakes.