Chis

I can answer this I believe.
I am sure Sara would back me up on this.
Official output figure is 10lbs.
However, because of how Wren work they only publish the lowest figure you could expect.
This means that most engines are over 10lbs, the odd one may be 10lbs.

I have 3 Wren 44 Golds

1 gives 11.25 lbs
1 gives 10.45 lbs
1 gives 10.50 lbs

Using the Wren tailpipe also brings the thrust up…can not remember the %.

Hope that helps.

Paul