Hi All a friend of mine as an Hyosung 125 Comet and as asked me as I have net access!, to ask if it's possible to derestrict a 125 comet, I've read somewere that something can be done with the exhaust, is their much of a gain, or is their something else that can be done to fix it, he seems to think it's a bit sluggish, I've suggested that he try's a different type of spark plug for the winter time, any suggestions please