And the cat is now clogged because of all of this extra fuel?
No problems with the cat adam, he had a tube instead of it.
Stock:
Catalytic converter, resonator, muffler
Tuned before:
Tube, resonator, muffler
Tuned now:
Tube, resonator, sport muffler
It seems resonator is ok, as he tired first of all by unplugguing the exhaust from the Down pipe, and results are the same as now.