I posted a question about these a while back, but I didn't really get an answer..
Do they stress out the rear end or the suspension parts?
Do they cause uneven tread wear
Considering that I sometimes drive like a mad man, should I worry about anything happening?
How many people here have them?
thanks

 

the only thing I really can say is call Mo at Swift Racing. I am sure he can answer all your questions.

good luck

 

I've though about using spacers on the rear wheels since I run 245/40-18 all around.

The wheel studs on the GS are pretty short so you would need spacers with new studs like these from H&R:
http://www.nascarplace.com/hrspacers/itm01886.htm