I think the rears will cause a bit of a problem, I'm running 15's with 195/50 tyres on the back with an offset of ET30. The car isn't lowered at all and I've had a bit of arch scraping when driving enthusiastically along bumpy country roads. Your wheels would probably have the same rolling radius with the 45 profile tyres but the ET25 offset will mean they are sitting another 5mm further out. I think you need to try them first of be prepared to have the arches rolled.