are you running a different silencer than shrubitup?
I still have my OEM silencer from my '04 if you're interested...it only has a couple hours of use on it.
I can't prove mine was a 2004 but that's what the previous owner told me. It's a 2004 OEM pipe and silencer. First thing I did was fit up the silencer just to see if any of the holes aligned. Then I pulled it and installed pipe. You hafta leave springs off until pipe is mated to silencer and both frame tabs are secure but loose. Then tighten down silencer then add springs then tighten down pipe to frame points.