So, I'm going to have to pass smog pretty soon, and I'm a bit nervous about it. Last time I've had my car on the smog dyno, it barely passed. One of the readings (forget which one) was right on the limit. I'd like to keep the car as is, and not take anything off. Everything is legal, it's just the car has a lot of miles, and the engine feels it. I know one good way to do it is to get the cats nice and hot, but I've also heard that there are some treatments that could help as well. What would you guys recommend?