Sorry, thats not how it works in SwedenWell if you do it all in one place you get warranty like any other, here would be the tuner workshop assunibg they do it all from a to z.
If you do half at home and ask for a tune I guess everyone will show you the door when it goes wrong.
If i do all the work at the same place i will still only have the warranties that TTE supplies me with.
The tuner usually provides a warranty on the actual ECU, but nothing at all regarding the car.
Not even all tuners are interested in doing any actual wrenching here..