I added 10 kgs of weight to the back of my n/a sportif and it was bang on what i was working for/ aiming for which is front 55 and rear 45 %. Weighed in total ,with what i just mentioned 897 kgs
Hope this helps,this info rarely comes up.
Just so happens i corner weighted recently . I have also written down the actual corner weights if thats of any further use .
Bare in mind the front end will be prob around 20-30 kgs heavyier at front due to stronger engine,stronger gearbox,turbo and manifold,stronger driveshafts.