Toyota call it a "front pipe exhaust" in their parts catalogue however the technical system explains it is an "Oxidizing Catalytic converter" .
The picture of the setup you have is correct the DPNR is in the front down pipe then you have Oxidising Catalyst and finally the tail pipe
Hey guys new to this site . Had the same prob after I fitted a rear caliper , discs and pads . My model is an avensis 2010 2.0 d4d epb brake . Had the fault code c1346 and c1336. Here is a bosh kts instruction on how to calibrate . It worked for me and auto hold and rev change and cruise control is back again . Any questions just ask
You can't, as the car has a DPF the EGR gas flow is monitored to prevent damage to the DPF if you blank the EGR you set a fault code and the car will go into limp mode.