From what the internet has told you. The B20 is know for its sleeves to fail, which i have yet to witness or know of someone personally that has had it happen, Personally i rekon with a NA application the sleeves will be fine aslong has you havent overbored it. Forced Induction is a different story.... Futhermore your saying even with sleeving the B20 isnt reliable?. Please explain.
Why would he want to downgrade to a B18?




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