Its the stock filter just with no box. Elevation is around 750 to 800. Ok that makes since then because it had the hex 170 keihin mains in already and I was told that would be around 300 mikuni mains, but I switched them out because I didn't want to run keihin mains in mikuni carbs, but they fit and worked fine so maybe I'll put them back in since I don't have any 300 mikuni mains sitting around. I'll try that and post if it changed or not.