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i was reading an article and the aluminum and carbon fiber were being discussed, i guess carbon fiber REALLY makes it nice, its only about 10 lbs and i guess it REALLY feels better, and it can take more twist then anything, also the slack if you are going like 60 and take your foot off and hit the gas again really quick that CLUCK in the the rear end, like slop, it eliminates that i guess, its supposed to be nice, the way i look at it, ANYTHING that saves gas is worth it, it makes your car easier to take off and less rotating mass which would have to improve mileage a BIT, it would be worth it in the long run but they are like $800 sooo
ya lighter is better, the less rotational weight you have the more power you can get to the wheels quicker and it would at least take of a few hundreths off at the track and the install is a snap.