Bought as a last gasp attempt to stop a Touareg "Exhaust Workshop" light from coming on, worn swirlflaps - the linkages having been replaced with the new improved part. Not wanting to replace both manifolds and actuators just yet, I tried this part.
As mentioned, there are no instructions, but they're simple to work out with the parts in front of you - and were fitted in minutes.
The light remained off for some time, but ultimately came back on, so whilst this product didn't fix my issue, it might help yours.
While these dont fix the problem they do stop the engine light from coming on again after clearing the code, I know one day I will have to get the manifold flaps repaired properly if I keep the car.