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I've had all of my previous cars with a sun roof. Its noisy, its heavy and it reduces the headroom. On a sports car, albeit a luxury one, in my opinion its pointless to have it.
I stripped out my E90 335i sedan and turned it into a dedicated hdpe and autox car. I personally weighed every single part I took off the car.
I can tell you that the entire sunroof cassette with rails, motor, glass, drain channels and hardware weighs 47lbs. That's a lot of weight and what's worse is that it is the furthest possible distance from the center of gravity in the car.
To truly understand what that means, imagine 45lbs dumbbell on a 4ft pole exerting torque. That's a lot of torque wanting to induce roll over.
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