Yeah one lad from Portsmouth thought he knew better and did it anyway, car blew up after 3 or 4 months. A claimed 25bhp is a pretty weak gain from these engines on a stage 1, since you know it'll be 20% less than that in reality. You'd be better off contacting one of the specialists on these engines. I know lots of people that do things all day yet are still shit at what they do. Poor maps really don't do these engines any favours, you will be able to tell by monitoring your mpg: if it goes up after the map you're probably OK, if mpg goes down get it checked by a proper mapper.
Edit: pretty sure the guys name was Ethan, you can probably find the project thread with a search.
Edit: pretty sure the guys name was Ethan, you can probably find the project thread with a search.