ok a stock b16a can handle up to 12 psi properly intercooled and with sufficent timing retarding and fuel. but 12 psi is too much if you ask me. run 10 psi max make sure you are intercooled. its not your sleeves you'll blow up its more like your rings or pistons you'll end up toasting. If you have the $ then buy a headgasket thats thicker to drop your compression.