[Dave ZS-X]

imo no.....tolerances are one thing but 15% up over rovers quoted figures is obviously a little bit optomistic.
If that were a zs 180 running 15% high it would have been a zs 200 out of the factory...sorry it would be great but it just doesnt happen.
When a manufacturer dyno's theyre engine to publish a figure they wont just pick one willy nilly, they will dyno several and release figures from the best one already, hence why most cars make either spot on the book figures or a little under.
Ive been to several rolling roads and they all claim theirs is accurate because of so and so, but try 5 different rollers and you will get 5 different results so someones wrong...or all of them are, lol.

Just be happy as its obviously a nice healthy engine.