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No, don't remove it. There's ducting to let air into the radiators and there's ducting under the car in that plastic panel to allow the air to exit. The car is designed fine to allow enough flow across the radiators to keep your car cool. If you remove the lower body panel you might actually allow air to flow around the radiators easier rather than forcing the air THROUGH the radiators. There's a potential then that your car could actually run hotter! The current flat panel would create vacuum at the outlet air duct, helping to draw air out of the radiators. Then with the inlet within the main air flow, you're forcing air in with positive pressure on that end. Overall the stock setup is probably pretty efficient.
Under body panels, like this one, also play a role in aerodynamics. Remove that panel and you run the risk of increasing aerodynamic lift and decreasing down force at high speeds. Maybe you don't drive at 100 MPH normally, but at those speeds having the under body panel missing could potentially lighten up the front end and make the car feel more floaty.
Bottom line, I'd leave it alone...
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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