To be strictly aerodynamically correct it's not a splitter, it's an air dam but that's just me being techy and dull

Interesting to see someone getting on ok with a GMax kit. I ran their 20mm drop kit very, very briefly. Just didn't work properly, ended up far too low (lower than yours on the -40mm kit

) and stiff for an everyday car and also had tyre rubbing issues. Still a mystery what they actually supplied but anyhow, I'm all Bilsteined up now and much happier.
S.M.