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Also except already mentioned more flexibility / safety of tuning right way in tune itself one should also consider who will do the tuning. Most competent pros/shops tuning these cars use some of tune editing/flashing solutions, eg. OFT or Ecutek, almost none - those piggyback ones. Most canned off the shelve tunes are also provided in most cases via those solutions. There is much more DIY tuning nfo & community around too on flashing solutions. So if you want tune by someone with more experience of tuning these cars, that strikes out those piggyback ones too. Desirability of piggyback ecu tuning with unknown quality tuning imho is alongside fuel-magnets / maf sensor fooling mods and such. As in - i wouldn't get one even if for free.
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