147 Piggy Back Chip
After spending a quiet afternoon browsing ebay I note that there are loads of these piggy back chips mostly going for less than a fiver. They all seem to promise HP gains of between 9 and 25!
Does anyone have any experience of them? Im guessing that its either too ridiculous to be true of they dont exactly do you engine any good at the end of the day.
So my questions are, has anyone fitted one, does it make any actual difference and if so what one was it.
BTW i have an 03 plate 147 2.0 selespeed lusso.
cheers for any advise you can offer.