Depends who's doing it and who what you want from it.
The manufacturer has programmed the ECU for the best emissions results. If the new chip is programmed bluntly just for performance only, you'll fúck your fuel consumption and limit your engine life as well as potentially fúcking the catalytic converter. If it's programmed sensibly it will be more of a compromise.
Of course your warranty will be instantly invalidated and you might struggle with MOTs...
How much more performance do you need?
Caveat emptor.
It's 2.0 TDI on my Audi. I'd heard that essentially manufacturers use the same engine for years and mysteriously the BHP increases and this basically down to improving the mapping with each new iteration of the car.....conspiracy theory?
It's 174 BHP currently......a little more couldn't hurt
They'll use the same iteration of engine for different power output / economy - which is all down to the ECU programming. Most manufacturers use an engine for about 5/6 years. They are currently going hollow to try and lighten them...
The most you'll get out of a 2.0D is around 200ps. That'll get you 0-60 in 8 seconds or under.
The difference will be in how much fuel it lets through and how soon and long the turbos spin, etc.
You should notify your insurers that your car has been modded.
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