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Yes they are very streetable but 15psi is too much for a stock motor.I would say 10psi would be the max,and thats with a motor thats in good condition and with a good tune.
Its been proven that a well tuned s/c'd engine if driven right will get better gas milage then a n/a car. I, pretty sure 8psi is all your gonna wanna go with a stock engine, any more and you'll be getting alot of KR