I saw the pipe at the sand sports show and it looked pretty cool and it claims 9 hp gain over stock yfz but i think there are better pipes out there for the money. I haven't ridden one or seen one out riding but if I do I will tell you about it.
I think if you ride in the dunes wait until your first trip and watch what other people have and ask them. If you go to Glamis like i do you know the drags are a perfect place to see who has what and how the bike preforms. I really like Curtis sparks but it may not be the fastest when i take my bike to glamis this season, but I bet you will see me turning some heads as i pass every z400, 440ex, polaris 500 and a lot of banshees down the drags oh yeahh and some raptors to :evilgrin