What happens if you take off the catalytic converter off a Scion tc?

Removing the catalytic converter from a Scion TC can lead to increased exhaust flow and potentially improved performance, but it also causes the vehicle to fail emissions tests and become illegal to operate on public roads in many areas. Additionally, the absence of a catalytic converter can trigger the check engine light due to the oxygen sensors detecting abnormal readings. Furthermore, it may lead to increased noise levels and could potentially damage other engine components over time.