without getting too scientific- i'd say the quick answer is DAMN HIGH! like an SUV!! i think i remember my car being around 4 fingers gap in the wheel well in the rear and about 3.5 fingers in the front!
i hear the canadan IS's are higher then the USA IS's stock. my IS is deff not that high brc. do a search for a pictures and compare yours. also try to look at the springs them selfs, what colo are they do they have any logos/names one them?