Would anyone help me to understand the lay of the land regarding ecu updates for CTT models?
Which ones are out there?
Which seem to give you best bang for the buck?
Which seem to improve fuel efficiency (or provide ability to switch maps for different driving types)?
How much do these cost?
Anything else I would need to consider upgrading with such an ecu update?


P.S. Sure would love to find a place that sells service manuals for the 05 CTT.


Thank you.