Not saying yay or nay, but I've had mine off for the past three years, I haven't noticed any difference in the way it drives or handles. Besides, that's the only way to find all the freaking oil and fluid leaks...lol!

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2002 X5 4.6is
1999 C5 Corvette
1992 Mitsubishi 3000GT VR-4
1994 Kawasaki ZX-9R
2005 Mazda 6 Wagon (Wife's)
1991 Mitsubishi 3000GT VR-4