Cinquecento/Seicento fit a tricker 40mm TB

now once its all fitted.
fire the car up.
now with the battery being off and the TB being non OE spec it will run rough.
take it out for a drive but dont rev the nuts off it.
a short drive to make sure it works then back home to check for leaks and any other problems.

the idle will fluctuate up and down until everything settles so this is quite normal

after that its just a case of driving it to let the ECU learn its new parameters.