I have the Benz Stealth exhaust on my 500 and 700. I just added the 700 this past week. It does quite it down alot, but kinda scared me with all the back pressure. I know an engine runs more effecient when it can breath freely, but they assure me that it doesnt hurt the machine. I was told that the "Stealth" exhuast is alot better than the Benz?!?!?!?!?!? It doesnt sound any quiter when your on the quad, but if your off the quad and someone else drives away, you can tell a BIG difference. Hope this helps
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myurl