hi mate,hes turbo`ing the ST engine,as well as replacing just about every part in there too by the sounds of things hehe.
i was under the impression it hadnt been done before (turbo`ing the ST150) but a lad i was speaking to said it has.
never heard anything or saw anything in the mags,as thats were i got ians number,from an artical saying he was offering the conversion.
if you were interested im sure he will be up for it again as he hasnt (yet) hit any major probs with it...