No that not a De Graaf. The boxes don't look like that. The side pipes out of the rear box has no bends and hanger arms in them which the De Graaf have. There's no De Graaf logo on the boxes. The centre box looks like is mild steel and not shiny stainless.
To put this under right topic. Here is a short clip of my QV with EVO system fitted. Need to sort my cell holder that slips under acceleration. Video can't do justice for the sound in flesh though. All I want to do is drive this car.