Tuning black box

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Tuning black box

Seen this on ebay http://cgi.ebay.co.uk/Fiat-500-1-3-Multijet-75-16V-DPF-Tuning-Box-Chip-Diesel_W0QQitemZ260520622958QQihZ016QQcategoryZ72205QQcmdZViewItemQQ_trksidZp3286.m7QQ_trkparmsZalgo%3DLVI%26itu%3DUCI%26otn%3D3%26ps%3D6 are they any good will they make it smoke more I had one on a GTTDI and took it to 160 from 130 bhp and went better on fuel what do you think?

Personally I would never touch anything like this - and certainly not on a new car. I always strikes me like the computer overclockers, no much what performance something provides, some people want +10% on top.

I know a few people who have tried similar things on Golfs, and generally had good things to say about them though
 
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