I have a Golf V 2.0 TDI which had a flash upgrade of ECU with the Optican OBD tuning which is probably similar to Oetinger and Revo Technik.
125kw and 375NM of torque for $1500.
Flash upgrade is undetectable, only a rolling road dyno would detect the difference.
The quality of power delivery is excellent and it will out pull local V6's as well as Mk 4 RS32 on the open road.
Before spending money on making the car a "Performance Car" a "High Performance" driving course will set you back less and show you how to get the very best from what you already have. Around Sandown Raceway the 2.0 TDI with standard tyres and brakes and no performance add ons is not a lot slower than a GTi when driven well so becoming a performance driver and learning to handle what you have already will make your car go a lot faster (and then upgrade chip of course!!).
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