Thanks and you're welcome. I'll add a few other comments/observations which may help you.
When you lower a vehicle and reduce those wheel arch gaps, it makes your wheels appear bigger than they are.
When I bought my M3, I wanted the larger 20" wheels because I felt they looked better and gave the vehicle a more aggressive stance than the stock 19's.
But, I did not want all the (perhaps minor) negatives that come with the larger 20" wheels.... increased weight, reduced efficiency, firmer/harsher ride, etc...
However, after I lowered it, any remaining thought/urge to some day change to 20's completely went away. This is because the lowered vehicle (with those reduced wheel gaps) makes my 19's look like 20's. In fact, I've had several people tell me they thought I am running 20's. So, lowering the vehicle gave me the best of both worlds... all the benefits of 19's but the look of 20's.
If you do decide to lower your vehicle, you'll definitely also want to go with either wider tires or use spacers to complete the look/stance.
Good luck and be sure to post pictures of your set-up for the community to see when you're done!!