i put a 03 1k header and mid pipe on my 01 600 it lost a little bottom end but made up for it 9000rpms and up. i just did that beacuse i didn't have the money for a header at the time, i bought my bike used and it had a d&d carbon bolt on it.
oh and i just bought a pc3 the other day so i'm sure that will make a differacne
oh and i just bought a pc3 the other day so i'm sure that will make a differacne