Join Date: May 2017
Location: Southern California, USA
Vehicle: 2008 SLK 350, Black on Black with Premium 2, Appearance, Heating and Sirius Packages
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Lots of variables that might be having an affect the performance of the wind screens. Weather, side windows up or down, vehicle speed, driver/passenger height. AC on or off, fan speed, etc. I personally found on our R172 (2015 SLK 250) that the lexan full wind screen did reduce the air coming from between the seats a bit. Was there enough of a difference to matter...not really, however our weather is milder here.
Not going to bother with it on the R171 we have now. Anybody want a R172 aftermarket lexan/velcro wind screen?...PM me.