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Old 01-11-2013, 05:15 PM   #16
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Join Date: Mar 2011
Location: U.S.A
Posts: 480
My Ride: 04 E46 330i sport
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Getting new pistons for better compression on M54 will be a good upgrade-maitnace at the miles we have on those vehicles. 150k miles on mine and it is nice to swap the pistons to ensure another 100k miles on the motor. Ofcorce you will replace all the seals and other stuff as you go, but it will be only cost efficent if you do it yourself. it means you need to work on your car for about a week every day after work to rebuild the engine. it is a big project to do , but yes it sure adds reliability and power if you put in some aftermarket racing pistons in.
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