As Ian said get the plenum silencer insert, I did last week <img src="http://jsramsbottom.co.uk/bbs/e/icon_smile.gif" alt="Smile" width="15" height="15"><!--graemlin:-->.

It reduces the crack a fare bit although not as much as a parker Hale or Logun but its £8.50 <img src="http://jsramsbottom.co.uk/bbs/e/icon_smile.gif" alt="Smile" width="15" height="15"><!--graemlin:--> and not £49.95 like the Logun <img src="http://jsramsbottom.co.uk/bbs/e/icon_eek.gif" alt="Eek" width="15" height="15"><!--graemlin:-->