I'd do the 35% in the backs to me 50% isn't worth it. It it would like tacky to go that dark in rear and nothing in front. I have 35% fronts and 20% all over rears. My fronts were 25 and I got a ticket. I bought the car like that though. In MO our law is 35% front any % rear.
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Formula SAE "Speed is Sexy"