Is it possible to put dome top pistons in my 04 300m
sure but...mill the head instead..
Adding compression will require premium fuel and modifications to the engine computer's tune. I would NOT do it.
try getting more air in the cylinder to compress... right behind the air cleaner box there is a smaller plastic box. put some holes in it. 1" (x3)devise a airfilter out of some close cell sponge, large enough to not be sucked out of the box. there you have it more volume to compress.
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