Scorpion Toyota GR Yaris Decat Downpipe & OPF DeleteScorpion Exhausts decat downpipe and OPF Delete for the 2020 onwards Toyota GR Yaris completely removes both the stock catalytic converter and the factory petrol particulate filter, allowing for better exhaust flow. The removal of the factory OPF and downpipe increases the tuning potential for the GR Yaris and unlocks a much louder exhaust tone. The Scorpion decat downpipe and OPF delete for the Toyota Yaris GR fit both the OEM exhaust system and the