Join Date: Apr 2014
Location: Hertfordshire, UK
Mentioned: 23 Post(s)
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Given you've purchased a 3rd party warranty, I think the tuning box is the better option. I suspect that even if you removed the tuning box and had an engine problem, if a garage looked hard enough they maybe could see a tuning box has been used...might be wrong though!
A remap can be detected (again if they are looking for it) whether it had a rolling road or not. It's just changes to the ECU they are looking for as I understand it.
The tuning box is certainly the lower risk of the two.
Current: Audi S5 3.0 TFSI Black Ed. (65) - Sepang Blue
Sold: Audi A5 2.0 TFSI Sport (09) - Phantom Black