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It is not the exhaust that gives the E46 330i its engine note; it is the air intake that gives that growl. Don't believe me? You should get someone to rev the engine while you listen outside front and back of an E46 330i or an E90 335i.
First thing for your N52 is to take out the charcoal filter in the airbox. Just do a search for "charcoal filter".
If that's not good enough for you, you may want to remove the airbox and install an aftermarket air intake.
Both these options are much easier and cheaper than changing the exhaust.
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2006 330i | TiAg | Black | Al | 6MT | Sports Package | Logic 7 retired
2008 335i | AW | Black | Al | 6MT | Sports Package | Logic 7 retired
2013 328xi | Red | Gray | Al | 8AT | Sports Line | Premium | Executive | Heat Pkg retired
2017 340i xDrive | Estoril | Black | Al | 8AT | M Package
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