yeah i think the 18" enkeis if i can find them in the right offset... to be honest my 20" chrome wheels aren't that much heavier than the stockers which say something about the strength of those wheels but like you said a car with the same drive train only 70 lbs heavier... wheels makes a big difference and i don't believe it necessary now to have the 10 inch wide tires in the rear now since the 20's are 8.5 and on straight line i can't really burn them. the stock tires though imo are trash i'm coming up on the wear bars with 7k miles on them that's bs no matter what. so the lightest 18's and the stickiest rubber it shall be.