I have a 2005 YFZ 450. When I went to pick it up from the dealer they said they were going to install a pipe and a jet kit well they installed a Pipe by DG called thet exxelerator stage one. I have not been that thrilled by the performace so I am having the sparks pipe installed on my bike. I am going to pick it up this weekend so I will everyone know if it was a big difference.

 

sparks is what i have, but its a personal preference...someone selling a pipe is gonna tell you all the things you wanna hear..if i made a pipe id tell you it was the best in the biz, mine kicks ***...lmao