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Old 09-10-2019, 09:49 PM
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Exhaust question for 4.8 motors

Hello, so my friend was just here with his 2007 4.8, which is identical to mine but his sounds more "throaty". Both are stock.
Did BMW have different mufflers for the e70 4.8's ?
Now i had to fool my secondary O2 on bank 2 because of the efficiency code i got. i'm wondering if my Cat is maybe blocked a little?
Truck drives fine and no codes.
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Old 09-10-2019, 11:15 PM
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are you both original owners?


A holesaw on an extension can dramatically change the sound of a muffler...
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Old 09-11-2019, 07:19 AM
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No but I’m guessing it’s oem. I’ve done work on both like, valley pan gaskets and valve cover gaskets.
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Old 09-11-2019, 09:17 PM
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Like I said, someone can run a holesaw into a OEM muffler and make it a 'performance' muffler- not a sign outside it was changed
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Old 09-11-2019, 10:24 PM
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Ok, but today i took my truck out for a hard run, and after that my engine sounds throaty again and responsive.

i just went to start it now after its cooled right down and it sounds quiet again and lazy.

No errors, or anything. I have the Reingold BMW setup also and not one DME code anywhere. i give up!

Do all 4.8's sound throaty when cold and hot?
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