I sold my version 1 and got the Version 2. V2 has a switch which allows you to turn it off, half power and full power. The grin was back on my face as soon as I pulled out the driveway.

Installing and removing takes less than 5 minutes. When I had it on my 550 I only removed it the first 1-2 service visits; after that I left it on. One thing I did was keep the allen wrench in my car JUST IN CASE.

Some people say it worthless and that's their opinion. For me, I prefer it on and with the V2 it's much easier to disable it from the switch when I valet or have my GF drive the car.

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2007 X5 4.8i | Grey Ex, Black Int | Premium - Sport - Tech Packages | Adaptive Headlights | Bluetooth | Park Assist/Back Up Camera and Monitor | Panoramic Roof | Xenon Headlights | Hill Descent Control | Stability Control |Adaptive Cruise Control | Rear Climate Package| Front\Rear Stabilizer Bars | Dual Exhaust System | Third Row Seating |

Mods: Sprint Booster V2, Black Matte Grilles, GP Thunder H8, H11 8500k Bulbs.