Its got to be one or the other time now but have got a bit confused regarding the best option for my TD5. The remap option is the cheapest as it seems to be about £199 as opposed to upto £400 for a chip / tuning add on unit. The remap seems to only be able to achieve supposed better running with only a small increase in power whereas the chip / tuning unit addon can produce substantial increase in low down power which is what I am after for towing. Any recommended suppliers / operators would also be gratefully received.