For as long as automobiles have been around, people have been looking for new ways to boost their performance and aesthetic appeal. However, adding modifications to a vehicle may have an impact on car trade-in value. Before you invest in a new aftermarket mod for your car, SUV or truck, review a few important considerations to bear in mind: Reconsider Removing the Catalytic Converter You may have heard about removing the catalytic converter as a means to slightly increase performance, but this is not a good idea. The catalytic converter is responsible for minimizing the emissions that come from your vehicle. Removing an operational catalytic converter from a vehicle is illegal in the U.S. and many countries. Aftermarket or Factory? Whether