anyone had good luck with these? They say they give more power how much? can you pull extra gears?

 

yes they do give you more power but not a lot. probably barely enough to feel by themselves. They work well with a slip on pipe or full exhaust system. If you get one, make sure to clean and oil it reguarly like after every trip riding, or if you ride locally maybe once every 3 or 4 rides. It helps to have an outerwear. The outerwear only cuts down air flow by about 3%, which is nothing, and it will help your filter stay clean but most importantly it will protect your motor from debree.