I just got my Z about a week ago. I have had about 30 ATV's and have had real good luck w/ LRD Exaust. I decided to get the LRD for my Z. WOW. Very Impressive. I am a dealer through LRD and they told me it produces more HP than any other. I am also a Duncan dealer,so I called them up and talked to my rep. He even told me the LRD was better than the Duncan FATBOY4. I am amazed at the differe :wink: nce it made on my bike.I didnt even have to re-jet it. If any body is going to buy an exaust...dont even consider anything else. One of the guys on my race team has a Z. He Runs a Yoshi. I can out run him by far. My throttle response is AMAZING.