As promised here are a few videos of the Powervalve system on Neil's 6
First up is the car free revving - "Off Boost" so just a nice crisp sports tone similar to stock...

The second video shows the powervalve in car, again running "Off Boost" - nice and relaxed, no boom frequency...

Finally for some action...
As the driver demands power, everything changes - boost changes the dynamic of the Powervalve system and we get that glorious Sports tone

- then as soon as the power demand lifts everything immediately calms down again...

Thanks for looking
Nige
