zx2down
Senior Member
My guess is the pistons are a bit beefier, and the valves offer a bit more flow. Probably just enough that even though they are both 1.5T even if it and the base had the same turbo on them it would still flow a bit better and take a bit more boost than the base 1.5T.True. It's also mentioned the Si will have "different pistons, valves..." so who knows.
It doesn't specifically reference mention what the differences are, for all we know it could be marketing talk for "technically different enough to qualify that statement" or could actually mean hardier components. I guess we'll find out once people start modifying these things.
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