I'm an advocate of not dragging parts. IMHO first the scraping sound then the crashing sound. Again my opinion is if you drag parts regularly you need a different bike because you're riding too close to it's limets. That being said there are some things you can do to avoid draging parts, the easyest is to slow down a bit, I know not a popular idea but we are talking about street riding. All ways haveing to get there first may mean being the first to the crash seen also. Something I'm sure we'd all like to avoid. Hanging off, picking the proper line, and throtle management can help with not draging parts and should be in everyones rideing skills tool box. Rideing is a thinking persons game if your heads in the game and you properly read/set up for and ride each corner you can get to the magical nervana of smooth yet fast, I get some right but mostly know I could do just a little better. I guess it's kind of a Zen thing, the more I know the less I know.