Should i de-smog?

Your post contains two different questions: "should you" and "how can you" de-smog a car. "Should you" depends on your conscience and your state laws.

Back in the late sixties, all the hot rodders were complaining about the smog controls. However, smog regulations were responsible for keeping the Los Angeles vicinity a livable/breathable area.

Whatever you take off, you should keep the stuff in a box in case you ever want to sell your car on eBay to someone in California. When you register a car here, they check for that stuff.