I have read a few threads mentioning these tuning box's are they any good? How much are they? And finally is it worth fitting one? The td4 to me is quite sluggish unless you keep it in the turbo and this only seems to have quite a narrow band so hardish work to keep it in the turbo. Not that I'm a boy racer but when towing especially uphill I find it a bit shaming being over taken by mopeds.

Have a shuft at his web site Darrnw or have a read of previous thread to do with Maf etc
45zs.info It shpuld sort out your Sluggishness
I got one and it made a good improvement ,no more Big surge when the turbo come in at 2500rpm Just smooooth all the way!(and smoke but thats another story)