I just did the SE Stage III big bore 110 kit with the SE585 cams. Definitely noisier top end but as long as it is normal I am fine with it. I also would like to know about the royal purple. I had it dyno and got higher horsepower than posted on Harley site but lower torque. However you will not hear me complain because it smokes all the bikes I ride with and it runs great from bottom to top in the RPM. It is so smooth at 3000 up to 5200. I wound up with 104TQ/101HP. I also believe there are a lot of over inflated dyno numbers out here but I am planning on taking it to Dr.Dyno when he comes to my area for Americade. Enjoy the ride