Has anyone heard of lifter problems on the newer model 103"S? I have a hollow knock noise coming from my 2013 RGU. It has a Screaming Eagle Hi Flow intake, Decatted head pipe with CFR slip ons and Andrews 57H cams. The noise didn't show up until after the cams were installed. I also have a Thundermax tuner. I have looked at the plugs and they look good as far as tuning goes. The noise is bothering me and is only audible from 2200 RPM to about 3000 Rpm. Any ideas would be helpful. I was told the 103's have poor quality lifters. Bike has 4000 miles on it.