Thread: Pistons
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#3: 02-05-2013, 07:37 AM
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you can choose compression ratio : lower compression ratio if you plan to make more boost. higher compression ratio if you want better efficiency at cruise

and the sizes are for over bore . so if you were to just change out pistons you would choose the smallest one. the others are if you rebored the cylinders if there are scratches .
Now that's thinking out of the boxer!
fyi all 05 + legacy's have built in code reader
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