^^ Its not so much about the BHP gains your getting as these will be marginal, and as Henk correctly stats will depend on the car in question.
What you will get is a much smoother power delivery, and utlise any mods which you have, such as the inlet, decat, system etc.
As I said the BB 182 had these mods on there already and there was a perfomance gain but this could only be put down to all of the above mods and the ECU.
For £100 this is well worth adding to the mods which you may have already done, but as said previously if you want the very best you will need to have a live map done, as this is a universal map not a dedicated one for you car/engine.
What you will get is a much smoother power delivery, and utlise any mods which you have, such as the inlet, decat, system etc.
As I said the BB 182 had these mods on there already and there was a perfomance gain but this could only be put down to all of the above mods and the ECU.
For £100 this is well worth adding to the mods which you may have already done, but as said previously if you want the very best you will need to have a live map done, as this is a universal map not a dedicated one for you car/engine.