Join Date: Apr 2006
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Reckon it's got something to do with the extra fuel being pumped through.
My DCi has never really smoked badly either before or after fitting the tuning box, but if I floor it, I have noticed a slight smoke screen coming from the exhausts in the mirror
I'm sure someone will have a better idea than me!
Currently in matt_dci's garage:
2008 Citroen Grand Picasso 1.6 VTR+ & 2009 '09' Merc Vito 109 CDi