If you want to really wake-up the
potential performance in your GTV-6, replace all the fuel injectors
with higher-flow injectors. You should check the injectors anyway
because they tend to get clogged as the miles pile-up. swapping them
out for new is not a bad idea.
http://www.oldebottles.com/italiancarspage5.htm
The Stage Two injectors mentioned on this site can be sourced from
these folks or from Bosch. I've been told that they are the injectors
used on the BMW 6-series from the mid-eighties. Not 100% sure of this
however, they could just as easily be the injectors used in the later
24-valve Alfa engines, especially the ones for the 3-liter, four cam
unit.