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I was recently standing next to the exhaust and I noticed that only one of them was working. i have an '02 330cic and it was in park and I was warming it up. Is this normal?
Yes, this is normal. All exhaust is routed to one tailpipe when running under 3000 rpm (or thereabouts) to keep things quieter. There is a flap that opens above that threshold to allow more flow under acceleration/higher speeds.
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Quote:
Originally Posted by BMWBeauty416
I'm scared if you took pictures of me cleaning a rifle Dave might consider it porn
lol yep it is normal i sugest against a K&N fiter or any fiters you spray oil on because the oil can kill your MAF sensor
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Exhaust air coming out of only one tip!! 
I was recently standing next to the exhaust and I noticed that only one of them was working. i have an '02 330cic and it was in park and I was warming it up. Is this normal? 
i sugest against a K&N fiter or any fiters you spray oil on because the oil can kill your MAF sensor 
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