I have the BMW OEM Deflector installed. Went for 80 MPH ride on the highway Top down today and with the windows down and the deflector in place the wind and notice is acceptable. Put the window and and at 80 MPH, the reduction in wind and noise is excellent with the deflector. This was my 1st real test paying attention to the wind and noise, top down. I would recommend the deflector.
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2009 BMW Z4 35i/SMG/DCT/Premium,Cold, Sound PK/Com Acc/Ash/PDC/Wind Deflector/Smoked Reflectors/Red Calipers/Cl Mask/M Series Grill/6000K LED's/De-Badged/M Pedals/CF Mirrors-Engine Cover/Stubby/20% Tint/H8 LED's/LCI Side Markers/Sniper Sprint Spoiler/VMR V710/H&R Sport Springs/KN.
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