blitz dump valve
 

just put blitz supersound on my rb5...
only question is that the instructions all in japanese.
managed put it on fine and working but there is a spare trumpet thing in the box which you can change..the one on at present is metal on side of the valve, but you can remove that one and theres a plastic little cone shaped one you can out on..kinda looks like mini k&n lol..
anybody know what noise it makes or difference to one already on..
be big help
cheers
dave