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The buisness of airtabs is to sell you as many as you do not need, 21 is a case of overkill, 21 would be great for a semi! before i can comment re number of tabs on the roof how many inches at the widest point? I have seen them and not impressed i beleive that you will find that your drag will go up..............if i had the cash i would bet on it.
I made nine shark fin style for a crx and have installed them and used them and can feel the effect on the highway and city as the air rushes over the roof the fins divert the air down onto the glass and off the back............to reap the full benefits of the vortex generators i can only conclude that i will have to install a air wing.......not a spoiler.
I can only suggest that you check citroen the pro's on aerodynamics and arrive at your own conclusion.................speaking for my self i usually coast down this bloody hill each day. prior to using the vortex generators i would coast at 50 miles per hour and with them 60 with a head wind or not...........I made my own vortex generators and am satisfied.............bottom line is too may will cause more drag.
I am sure this entire matter is and will be open to debate.
Your typical vortex generators are four inches apart and one inch from the edge of the vehicles roof
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