BMW E90 328i N51 Muffler Delete | Dual Conversion Performance Mod for Insane Exhaust Sound!

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Converting a BMW E90 328i N51 to a dual exhaust setup with a muffler delete is a modification that involves removing the stock muffler(s) and replacing them with straight pipes, essentially creating a straight-through exhaust system. This modification is commonly done for performance and sound enhancement purposes. However, there are some important points to consider before proceeding with a muffler delete:

Sound: Removing the muffler(s) will significantly change the sound of the exhaust. The exhaust note will likely become much louder and more aggressive, which may or may not be legal or desirable depending on your local regulations and personal preferences.

Backpressure: Mufflers serve to reduce exhaust noise, but they also create some backpressure, which can aid in low-end torque. By deleting the muffler(s), you may experience a slight reduction in low-end torque, though this effect may not be very noticeable.

Legal Considerations: Muffler delete modifications might be illegal in some areas due to noise pollution regulations. Before proceeding with this modification, ensure that it complies with local laws and emissions regulations.

Drone and Cabin Noise: A muffler delete can result in increased drone inside the cabin, which may be bothersome during highway driving or extended trips.

Check Engine Light: Removing the muffler(s) may alter the exhaust gas flow, potentially leading to the activation of the check engine light (CEL). An ECU tune or the installation of an O2 sensor spacer may help prevent this issue.

Resonators: Some vehicles have resonators in addition to mufflers. A muffler delete will not remove resonators, so keep in mind that the exhaust note might not be as loud or aggressive as a full muffler delete.
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