All forums have people with dyno readings that are silly, they dont knock them though. As soon as someone gets an accurate lower reading, everyone says how the RR must be reading wrong, it was hot that day etc etc
The only leon i have ever had leave me had a massive turbo conversion and was pushing 350bhp. Have had another Cupra R try it with me. It was a stage 2 and the guy thought it was 300bhp, i destroyed him from standing and rolling. He has since RR it at another place and got 248bhp (much more accurate)
I can assure you they used over reading dynos to get 300 bhp.
The above graphs are from the same (as in model) car. The standard one hits book figures, the stage 2 with intercooler, exhaust and induction struggles to hit 250bhp. Still quick mind.