Convertible spoiler effect

The cockpit of my BMW 325 convertible seems to be a lot more turbulent than my Infiniti M30 when the top is down. Would adding a rear spoiler help?

i think adding a rear wing would smooth things out behind you but it could channel air into the cockpit I am not sure really.

no it would not help.

There are special "wind removers" (or whatever you want to call them) you can buy for a convertible. Basicly it's a "wall" behind the front seats so the wind wants to go over it.