I've had good results(2\10th's)on a 15 sec bug,with a couple of rolls of tape.Smoothed out from the rain gutters to the roof,A pillars to screen,hood gap etc.Basically anywhere air was going in tried to stop it.But latley been thinking alot about the air thats inside,i'm sure vents on the vertical trailing edge of the front guards(without the splash pan) will reduce pressure/turbulance and speed up the air down the side.Some sill extensioms like an aussie V8supercar may help also.A buddy works at Dan Gurneys and he does aero stuff will be giving him a call to pick his brain.cheers