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The BMW Range
3 Series
E46
::330 Screaming In the Tunnel::
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<blockquote data-quote="B33mEr" data-source="post: 661931" data-attributes="member: 13609"><p>Yes it is normal to have a loud suction sound due to easier breathing provided by the K&N. Stock intake is best for performance simply because air is drawn in from the outside via the nose grill ... BMC CDA, GruppM or any other intake solution draws the air inside the engine thus it's not optimal especially during the day. At highway speed however it gets better for the BMC type intake.</p><p></p><p>p/s: agree with BC, you need to check out the cel and brake lights see whats going on.</p></blockquote><p></p>
[QUOTE="B33mEr, post: 661931, member: 13609"] Yes it is normal to have a loud suction sound due to easier breathing provided by the K&N. Stock intake is best for performance simply because air is drawn in from the outside via the nose grill ... BMC CDA, GruppM or any other intake solution draws the air inside the engine thus it's not optimal especially during the day. At highway speed however it gets better for the BMC type intake. p/s: agree with BC, you need to check out the cel and brake lights see whats going on. [/QUOTE]
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