Did a bit more on the weekend here are some more pic's for those of you looking to do the same thing, so will call it stage 2 i guess.
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you only need to cut it the once as i found out,..so if you cut it where i have you can twist it out as its not welded in ... i then plugged the holes going into the other chambers,..not sure if you need too.
Does it sound louder? Yes
Is it worth all the work? Not sure ... if your after a cheap way to make it louder and want it to look totally stock then maybe,..but im still wanting a bit more.
I thought it was going to be louder,..with full face helmet on at 80kph i cant really hear it still.
on another not if your going to the trouble of cutting and welding i suggest putting a spot of weld on the inside/facing engine of the pipe at the top, to stop the clamps always falling to the bottom when undoing them, as pictured below.
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thinking of opening up the perforated bit to get a bit more volume