Just took a pic of mine for you (sorry it's sideways, uploading from phone and it rotated it). As you can see there's quite a bit of clearance with the stock shocks, I'd say a good 15mm. Obviously BC's are thicker though. I'm not sure how much but you can work that out. Mine is as stated earlier s2 rs4s running 18x9.5 +12 with 245 40's.