This is most likely an aftermarket turbo downpipe (dump tube). There are many like this for sale everywhere as this is most likely an universal part. The larger fitting is one side of a V-band fitting that comes by default on many aftermarket turbos. V-band fittings come in different sizes. The two bungs are most likely for a lambda sensor (o2 sensor as you guys like to call it in the US) and an exhaust gas temperature sensor (EGT) or aftermarket wideband o2 sensor which allows the tuner to measure air/fuel ratio correctly. The price of this depends on the quality of the welds and the tubing wall thickness and the material as the cheaper ebay ones tend to crack at the welds. I linked you something similar and a google link that shows what a vband looks like aswell as some other similar downpipes.

This is most likely an aftermarket turbo downpipe (dump tube). There are many like this for sale everywhere as this is most likely an universal part. The larger fitting is one side of a V-band fitting that comes by default on many aftermarket turbos. V-band fittings come in different sizes. The two bungs are most likely for a lambda sensor (o2 sensor as you guys like to call it in the US) and an exhaust gas temperature sensor (EGT) or aftermarket wideband o2 sensor which allows the tuner to measure air/fuel ratio correctly. The price of this depends on the quality of the welds and the tubing wall thickness and the material as the cheaper ebay ones tend to crack at the welds. I linked you something similar and a google link that shows what a vband looks like aswell as some other similar downpipes.

References:

https://www.amazon.com/OBX-Performance-Exhaust-Universal-90-Degree/dp/B01LYJS...

https://www.google.com/search?q=vband+downpipe+90+degree&tbm=isch&ved=2ahUKEw...