I don't but I have heard them and there is not much difference between the stock and the performance one. For the money I would spend it on other accessories. Hope this helps.
Moscow Lodge PA #504
2018 825e--- Warn 4500 ProVantage s winch, LED pod lamps, K&N Dry flow air filter, Super ATV half windshield, KFI 66" plow.
RSX 850i- Camo Trail model.--JD Half Windshield, Sport Roof. (sold)
It is stainless and looks excellent. As far as adding power, I doubt it did much. I run mine without the big heat shield, it looks like a muffler on a sport atv. I also take the spark arrestor out occasionally. It makes the exhaust note quite a bit deeper.