I see that wrap on bikes here and there and just wondering what exactly that does besides lowering the header temp? Is it worth the money? How much is it, what's it made out of? I would never put it on because I think it makes the bike look really shabby up there but never the less I am curious to what performance gains you get from it or is it just to help the motor live longer by way of cooler temperatures? Would a air cooled engine benifit more from it over a H20 job?