They are a super sick looking wheel and add a "chunkiness" that really makes the 6 look bad-ass. If memory serves, they are about the same as stock weight in 17" and a little heavier in 18". Not so much that you'd notice a difference. A really nice look. I have a silver wheel with a semi-pollished lip on my SG and it looks amazing IMHO. Please be sure to show us pics, and hey nice grille!