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Message: <blockquote data-quote="ramsing" data-source="post: 361287" data-attributes="member: 4754">if the meth/water is the cause of it, then why only piston #3 & 4 is affected? looking at your intake manifold, #3 & 4 is right smack where the air comes in wiht the meth/water. so if uneven distribution is the culprit, shouldn't the pistons further out be leaning out, like #1 or #6? and from the pic, the plug looks white.but didn't you have the same problem previously? before u added the water kit? was there a solution to that? maybe you could try the same route? if there's knocking, means something is not right. it wont go away, and the ecu can only retard so much. lowering the CR and using forged pistons is not solving the problem. with ur current tune, u wont be optimising the setup. might as well rebuild stock and get a thicker gasket. the stock engine can be pushed more, its just figuring out what's not working. but having the same thing happen twice, means the problem is still there.</blockquote>