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I see two problems with this as a business model (in the US):
1. In 49 states, a replacement "universal" cat can be had for roughly $100. This means you'd have to undercut that price for your service...not a whole lot of profit.
2. In CA, you'd be installing a "used" cat on a vehicle...which is prohibited by CARB rules. You'd have to convince them that a "reconditioned" cat is the equivalent of a new one...a task that I'd guess falls somewhere between "extremely arduous" and "impossible."
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