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I now notice halfords hardwire it in so no messy cables everywhere.
http://forums.overclockers.co.uk/showthread.php?t=18676481&page=6
Don't let anyone from Halfrauds ever touch your car... that would be a terrible mistake.
There are plenty of reputable places you can get it done...
That doesn't mean getting them to admit to and sort any problems will be quite so straight forward.End of the day what is the worst that could happen? They do this all the time and will be insured incase anything goes wrong as its a massive company ...