I spoke to Forge recently and they said if i fitted the Optimus Diaphragm Valve in reverse it would make a waste gate chatter sound rather than fitting the forge DV007P witch would make the typical woosh noise. Alos forge aredoing a 10% discount at the moment and the cost of the Optimus Valve is ?109.86 inc p+pi would like to get the waste gate chattering sound on my golf, like the scoobys and evos have, i dont want a crappy dumpvalve wooosssshhh thow, any one got any info that could help me ???? cheers!