I actually emailed Howitzer, as I really liked how his car looked. He me know that the outsise of his tire rubs a little with the lip of the fender. He also said that when he drove alone or 1 passenger, no problem but with 2 people in the rear once in a while he had rubbing if he hit a good sized bump or dip in the road. Its not an issue for him, but I am pretty much decided I won't lower as I don't want any rubbing at all. Maybe Eibach Prokit will work as I understand the lowering is less than H&R.

 

I actually have the same problem just installed the 166 with the m6 offset, and i just rubbed lastnight on a bump in the road, the first time i had 2 people ridding in the back. but i also wanted to install the eibach springs because the front doesnt seem that low. But the rear looks good, pretty close to the font part of the rear fender so i think thats where it might be rubbing. So i guess i wont be lowering my car as well

 

Lower it! Its almost a must with the 166's and lower profile wheels. It just won't look proper. Also, if you DO lower, make sure you get new shocks and struts. Do not use OEM shocks with different sport springs. You'll just blow your shocks out fast.

p.s. - if you're rubbing on OEM shocks its because they're made to travel up and down much more than a sport shock would. Mine almost never rub because its stiffer. Only when I have several in the car and hit a big dip or bump as noted.