hey mate ive been there once myself too .. as they said my car was too low which it wasnt 110mm from lowest point , mainly tho for not having a box for my pod. The guys there dont look at anything else just talk to them as my side skirts arent GTT items they are GTR ones lowest point came to a tear drop shape from which they concluded it was lower then 100mm once they measured that came to be 110mm , as for the box well i copped a 70 fine and 1 point , for which they cant get me now , putting bigger wheels isnt a defect as long as you keep ur rolling stock height the same as your stock, ive got 20's on mine i can easily go 22's with 25 profile tyres and keep it legal ..