Modifying/hotrodding you car is not illegal. Removing or disabeling emission equippment IS. As long as you use CARB approved upgrades, it is perfectly legal. Which brings me to my latest mods, LTs and minicats.
There are three reasons you are allowed to 'replace' your catalytic converters, per Flowmaster. (Going with their SS 3 way)
1 missing
2 failed
3 certain age, sorry dont recall the years.
I have posted this before, it is those who chose to ignore the law are the ones fucking it up for the rest of us.
Ps: funny thing, the JBA LTs were sold as Carb legal except CA emissions states. See attached pic. lol
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