Originally Posted by tabetha

It was I'm 99% sure just some de shrouding of the exhaust port, as person who did it(Damico 01953 717784), said they are a bit of a disaster flow wise for performance, situated about 5 miles from Snetterton circuit.
The next step is another £300, which he says will improve all over the rev range again but even more, it really has made a surprising difference esp at top end where it used to run out at 5500 or so, pulls a lot harder to this and beyond, keep hitting limiter in 4th dead easy.
tabetha