None, they are not pliable materials and in most cases require a professional install. However it does offer some weight savings though many will say limited (I'm not the "many") but it is expensive, labor intensive and if you neglect to wash your car is looks dull. When washed and waxed, well I can't go a mile without looks and thumbs up. With that said if I had to pay for it when I did it, I wouldn't have done it in the first place, its damn expensive.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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