The issue is that people can just swap out an exhaust before the smog test. I only smogged my car once having lived there for 9 years. Maybe twice? But still, w

The issue is that people can just swap out an exhaust before the smog test. I only smogged my car once having lived there for 9 years. Maybe twice? But still, whoever has the skills to install an aftermarket exhaust also has the skill to reinstall it, probably.