It says we strongly urge you to take it to a authorized Harley dealer. Can't void your warranty if you do it properly yourself and can prove it with receipts.

 

When the computer is plugged into a VW, a code comes up if the ECU has been modified.

I wonder if the same applies to HD, or is there any other info that shows that the Tune/Air flow etc. has been altered, ie for warranty issues?

 

Google Magnuson-Moss Warranty Act

 

Yes, the digital tech when uploading logs back to hd shows your ecu as "tuned". as far as vw/audi you never see it has been tuned but a secret log is sent back and on your vin info in the database it shows "td1" which is code for tuned and can be used to void your powertrain warranty at their discretion, Mike (33 years with vw/audi)