Aye.. I think im going APR simply because of what i have seen in the forums that it is the most concervative.. which it also stays withing the boundries of safe limits set by VW. I did ask my dealer, who is very cool with mods, and he said that even if the "program" is not detectable.. when they hook the vehicle up to thier diagnostic machine, which they do for "ALL" warranty work, it reads the ECU mapping.. and ANYTHING "A/F, Longterm Fuel trims" anything.. that is not within the VW Programming gets "looked into" and if it is determined that the ECU programming has been tampered with they will "Not Void" the warranty.. but "Limit" the warranty. Which he basically said they will refuse to pay for it unless you can prove that the ECU program didnt cause the problem. And that the Dealership actually has no control over it, but VWOA refuses payment to the dealership for said work. He told me that he would warranty my car regardless of the mods i make, as long as VWOA doesnt know, and with ECU chipping, thats hard to hide. Which is why i am going with APR, simply because it is within all VW set tolerances or whatever they say. Just my $.02.
