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yup Martin this was what i was thinking........
so a dump valve before the final box that opens at 4k and closes under 4k would be good ?
allowing for a quiet system under normal driving but with the foot down all hell gets let loose and so does the power...
maybe cutting half a second off...
I allways thought you wanted more back pressure at low rpm
and less back pressure at high rpm
I used to have a yamaha Rd 350 motor bike that had a restrictor in the
exhaust pipe that moved via a motor at higher revs to open the flow down the pipe,it was called ypvs yam power valve system
I...