Depends where you live I guess, I live in surrey/middlesex and there are a lot of speed bumps around here, also many car parks have those 1 way metal ramp things, I park in a multi-storey for work, and a lot of the time when out and about I have to park up a kerb. I'm only lowered 40mm and I manage to scrape my splitter a fair bit, any lower and I'd be buying a new one every week!