If its a TSI and not Tfsi then last i heard Niki doesn't map them....yet (MED17 as opposed to MED9)
What year is it? As it's a tricore ecu it could be protected meaning the ecu will need to be opened to flash it, Usually late '09 onwards are protected, could be before this if it's had an update from VW...
If sticking with a basic map i would go with the likes of Revo or APR
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