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      12-19-2012, 07:51 PM   #10
dboucher30
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Drives: E46 328i / F30 335i Sport
Join Date: Dec 2012
Location: Kaiserslautern

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Both engines are good IMO. The main difference is the exhaust. The new N55 engine has one exhaust pipe the feeds from all 6 cylinder (for less fuel consumption) while the N54 had 2 pipes, one feeding from cylinders 1, 2, and 3 and another pipe feeding from cylinders 4, 5, and 6.
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