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Good quality glass bodied cars are generally sealed better. FFR cars are great however they require a bit of planning if you want an air tight seal. I know several FFR guys that say this often. Glass inner panels are bonded or laminated to the body so air leaks, water leaks, engine heat, and cold air are blocked at all points. Carpeting does help this issue, including noise, with FFR cars however they are still not 100% sealed. Of course I am not trying to upset anyone, FFR cars are great they just require extra effort to seal up all areas. Look at a FFR car at points where the body and foot box areas meet there is usually some type of insulation or something inserted to seal up the car. Of course if you are going to use the car on the track weight might be a larger concern and that would differ between manufacturers.
Good luck,
Jeff
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