the one with the little blue valve goes from the intake to the opti and the other goes from the opti to the throttle bellows... i would imagine since its a vacume line taht valve is only going to let in air one way... so blow on in one side and if it doesnt let the air through you know which way its gotta go.. but i do beleieve the shorter hose connected to the valve goes toward the intake... and the longer side goes dist...i could be wrong but i can look tomorrow for you
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97 Firebird Formula - 383LT1
15 Subaru WRX - 2.0L-turbo
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