i think xpt has a maps and think stage 1 and 2. I just looked at the stock maps, I see why people say the say the si drive makes a difference. if you dont have it on sport sharp mod the boost targets are a little lower and the throttle begins to close a little on the intelli drive.
the mapping on them is pretty interesting. it takes like 3 maps to figure out how far to open the throttle plate not including which mode you put it into.
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6 letters spell it, 5 lifters be ticking on it, 4 cams spinning on it, 3in cutout on it, 2 heads flowing on it, 1 turbo creeping on it, SUBARU.
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