I can't give you a solution, but can only tell you that on my factory GT5-S, there is considerably more air coming out of the center vents than out the sides. The sides have really very little air coming out.
The original owner tells me that this is factory standard, it has always been like this.
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Charlie McCall
1972 DeTomaso Pantera #3847 (for sale)
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness across Europe"
http://briefcase.yahoo.com/gt5s_1985
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