OK! I posted this in the general forum and not had a sensible response so heres hoping! I had a tubi on my 355 1 year ago. Whilst I agree it sounds good at idle and at the top end this is at the expense of resononance at 2/3 k which I dislike. It sok if your just doing small runs but longer ones- not very nice. The original is too quite. Is there anyone here that feels the same?? that has FIRST hand experince of doifferent types ie capristo, fuchs, ect Heiko did send a post telling me how good it was but he sells them!!