I know that a map provides you with around 115bhp and a lot more torque, if you join the 306 owners club, http://www.pug306.net/, there is a lot of helpful advice there, and probably people who have their 306 hdi mapped with the files for you.
Just found this when searching for free (but decent) map files for a 306 hdi, know it's an old topic but did you ever find any? I'd like a Mr Whippy one but can't afford the money for one.
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