Not to be a jerk, but for future reference the word you are looking for is "exhaust" not "exost." It helps others comprehension and recognition.
In regards to your query, sure if you got a different mandrel bent pipe and can mount you could probably raise up your Yosh pipe a bit towards the tail, but why? Why don't you do it the right way and get an actual high mount exhaust kit that is made that way? If you start jerry-rigging your stuff, it could turn out for the worse. Just my two-cents... ok maybe three.
My buddy has a Devil High Mount on his R6 and the sound is perfect. I think its a tad louder than the Yosh, but some of my buddies think its quieter. Anyhow, you cant go wrong with Devil or Yosh, the exhaust note on these two are perfection.