http://www.takakaira.co.jp/accessori...ightpager.html
ELECTRONIC NA BLOW OFF SOUND GENERATOR
Once the accelerator is stepped off, the NA Blow Off Valve will generate a sound like a turbocharged vehicle's blow off valve. The sound from the NA Blow Off Valve can be adjusted to be the same as a turbo blow off valve. The NA Blow Off Valve sounds like a real blow off valve in turbo applications. You will not be able to tell the difference on the sound generated between the NA Blow Off Valve & the turbo blow off valve. The sound generated is conspicuous, and will not make one have a second look to ensure if it is genuine.
2 types of timbre are available for selection.
Built-in amplifier ensures adequate 10W increases.
3 wiring points ensure simple installation
For most Japanese car models. However, flap system and Kalman system might have air flow issues.
NA Blow Off Sound Genarator, Sound Speaker and Installation & Instruction manuals are included tis kit.