Found this and i take no responsibilty in the guide, could be usefull?
http://derby.polog40.co.uk/oldsite/modification/dewedge.html
that was written by me about 7 years ago :) should still be fine although I did replace the rivets for liquid metal to close the holes off, this works fine but make sure to countersink the holes on both sides (so the liquid metal cures in an hourglass type shape).
just wondering what is the point behind this mod, what does it give, i remmebr a mate telli g me about it befor. cheers
Lets more air into the engine so it de-ristrict's the inlet.
There is a difference in power, not massive though.