Very cheap and heavy duty but the unit was not a good fit on my Street Ka unfortunately.
Comparing it to the original ford back box that I had taken off the car, it was clear that the tail pipe hanging bracket was 4cm lower/shorter than the original and the tail pipe was 3cm longer.
I had to grind 3cm from the tail pipe to get it on the car but once on the exhaust was blowing straight into the back of the bumper causing it to distort/melt. I then daisy-chained an extra hanger to drop the box down 4cm to clear the rear bumper and it is now spot on. If you are planning to do this, you need a "Uprated Sports Heavy Duty Car Exhaust Hanger Bracket Rubber Mount Universal Fit" and an M10 nut and bolt.
You'll also need a 48mm clamp to join to the centre pipe as the back box doesn't come with one. It was quite a loose fit and needed plenty of paste and tightening to stop any blowing - but that could have been down to the size of the centre pipe.
The car was off the road for an extra few days as a result and in hindsight I should have opted for a more expensive unit having also spent a extra tenner on bolts and brackets but maybe could have had similar issues with a pricier unit off ebay...
I can only assume that the box is a compromise as it was listed as fitting a both a Ka and Street Ka.