Let say B20B,what size should i use?

Jasper

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2'5 loh
 

danieL

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agree 2"5
 

Xenix

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vtec[rock] is a different case.. he got no option to choose between 2.3" or 2.5" as his car is fully loaded 2.0L so he got no choice but to put in 2.5" or else it is not enough for his powerful engine.