stock b16a sleeves are fine providing your engine tune is correct.
i ran stock sleeves at up to 36psi @ 10,750rpm in my engine, i have never hurt a sleeve..... cold intake temps,low exhaust temps and back pressure, a good ecu (motec),good fuel and a tuner who knows what he is doing will never split a sleeve ( unless the engine gets a dose of dud fuel or runs very warm when its under boost)
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