A remap will immediately flag up a TD1, http://www.audi-sport.net/xf/threads/td1-warranty-and-a-tale-of-woe.273664/ whereas a tuning box will not however it maybe possible for a technician to read the ecu code and see some readings beyond its normal parameters. However I haven't heard of this happening.
Depends upon whether you wish to preserve the warranty I guess...
The MTM solution appears to be much cheaper than the Abt. These seem to interface with the ECU as opposed to just the intercept and modify type. Not sure what the differentiatiors are.
MTM from previous experience is horrific. Having previously owned both MTM and DTUK, I can confirm that DTUK is far ahead in terms of power and driveability.
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