| Hi Karl,
John Hackett (JHP) does his own 52mm half system at a good price, i have them on mine and they sound great and the bike responds a lot better.
If you are looking for a bit more bottom and mid rainge i would seriousley consider an 853 conversion, did mine and i cannot overstate the difference it made.
i know it's all money but you don't have to do it all at once and it gives you things to look forward to.
Hope this helps you, have fun.
Mark |