Is a catalytic converter required for 1998 dodge ram 2500 with an aftermarket exhaust?

While a catalytic converter isn't *required* in the sense that you won't get a ticket *every* time you're pulled over, it's illegal to operate a 1998 Dodge Ram 2500 without a functioning catalytic converter in most jurisdictions in the US and Canada. The vehicle is subject to emissions standards.

Even with an aftermarket exhaust, the system needs to meet emission regulations. Aftermarket exhausts are typically designed to work *with* a catalytic converter. Driving without one could lead to:

* Failure of emissions testing: This will prevent you from renewing your vehicle registration in many places.

* Significant fines: Depending on your location, the fines can be substantial.

* Damage to your engine: The lack of a catalytic converter can cause unburnt fuel to enter the engine, potentially causing significant damage.

In short, while technically you might be able to *install* an aftermarket exhaust without a cat, it's highly recommended (and usually legally required) to install a replacement catalytic converter or a compliant high-flow catalytic converter designed for your vehicle and exhaust system to remain street legal. Removing it intentionally is illegal and highly inadvisable.