I had mine done by Angel tuning Audi a4 2.0 TDI went from 146 to about 180.
But i did buy the DTUK box for my new Insignia, this is the Inline unit which you plug in, my engine injectors lasted 20 mins then blew up.
Spending 300 to 500 is the real deal, anything for 170 wont work very well, and may even blow it up.
if i was going to buy any off the shelf self mapping tool it would be Bluefin, other than that get a mapper to your door.
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