the forge 007 (the one i used to show which pipes to block) will give you the same sound as you'l get from doing this (wastegate chatter) they are designed not to make any noise but if you have a filter it will make one.
The forge Split-R valve (what I got) comes with a trumpet or blankin plate, when you screw the trumpet in it gives a tsshhh sound, very similar to that on the rice mobiles and if you put the blanking plate in you get the pigeon flutter, hope this helps
