Anyone recognize these back boxes?

[allandwf]

The picture I posted earlier was from Eurospares for Quattroporte, they look identical to me.

 

[ChrissGT]

Tubi QP loud version (since it has the competition tag) non valved: https://www.eurospares.co.uk/tubi-exhausts/3?ModelName=Quattroporte

500 sounds like a good deal for someone looking to get loud.