It's Weber la not Webber <_< . IMO, if your engine already running on injection, why do u want the hassles to convert to carb just to play Weber, unless u don't mind it's fuel consumption & tuning difficulties. Better install quad throttle bodies (quad TB), similar concept to twin carb but quad TB applies for injection. Hmm pros & cons?
- U might lose some low-RPM torque but u'll gain massive torque at mid/hi-RPM, depending on how it's configured. Running twin-weber/quad TB on 1.3 engine may cause normal/city driving suffer
- Fuel consumption? If tuned properly will not make a large difference, but webers sure harder to tune that quad TB
- U may need a bigger fuel pump. For injection, stock ECU is not enough, u'll need at least adjustable fuel pressure regulator & pigyback ECU