My understanding is its like blocking the EGR without blocking it.
Reducing the flow of exhaust gasses into the engine without the engine managment light coming on.
I've known people run them in their 4 pot TDIs and apparently noticed a difference.
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06 3.0TDI Quattro:
Options:
Soft close Doors & Boot, Electric Blinds, Keyless Entry & Start, Bluetooth HandFree, Quad Zone Climate, APS+, 3 Spoke Sports Tiptronic Multi Function Steering Wheel, Heated Seats All Round, Black Leather Comfort Seats, AMI, Sunroof, Drivers & Passenger Electric Memory Seats, Auto Dimming Mirrors, Bi-Xenons AFS2, Dab, Digital TV, Reversing Camera, AV Inputs, Fridge, Solar Roof, TPMS, facelift rear lights, 3G, remote boot closure, Tow Bar.
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