This is a quicksilver 4.2.1 manifold and decat pipe. Stainless steel. It will fit with standard and after market exhausts.
On my car it made 203bhp when normally aspirated with remap.
285bhp when the car was supercharged.
Was used on the car for approx 8000 miles, but has been sitting in a box in my garage for a couple of years.
As you can see it has been wrapped in heat wrap to help keep engine bay temperatures down. The wrap was replaced approx 1000 miles before it was taken off the car. As you can see it discolours as it goes through temperature cycles and cures.
Would be looking for £300 plus shipping at cost.
Let me know if you have any questions.
Cheers
Will