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Currently stage II OTS map with an Accessport. My question is can I install the 3port and be OK until I get a protune? Does the 3port mess with the boost levels as soon as it's installed or does it only change them when tuned?
dont install it until you get to the tuner. it is not hard to install it , so basically no point to do it before you get there. Way to risky to drive it without retune.