Got a friend who exchanged his orginal YZ450 2003 pipe unit for a FMF muffler and powerbomber curve. He ended up preferring the orginal YZ curve and uses the FMF silencer. I have a original WR450F 2004 pipe on my bike, just "uncorked" it. I wanted to know if any one would recommend me buying the YZ silencer and power-bomber curve for my WR450F. What are the advantages?