i would tread very carefully after 18psi!! remember block is alloy!! i read an thing many moons ago now that the sr20 will start pingin at about 18psi but wont really be noticed till about 21 22 psi!! not sure how true it is!!
but u think man 17psi with that turbo in a 1600 thats weighs about 700kgs its gunna move either way
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