Hi There's a stretch of road on my daily commute that's perfect for an occasional Italian Tune up for my I-CTDI. However, when I look in my rear view mirror there's quite a lot of grey/black smoke - possibly more than I would expect. Obviously it's difficult to quantify the amount of smoke - it last for about 6 or 7 seconds when accelerating hard, then if I do the same shortly afterwards there is no smoke. I drive like a vicar most of the time which is why I redline it about once a week. Should I floor it more often? Clearly having no DPF means some smoke will come out this exhaust but I just wondered how much is normal. Bit of a how long is a piece of string question - apologies. Any thoughts would be appreciated.