Exhaust question for 4.8 motors

dadysev · #1 09-10-2019, 09:49 PM

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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ard · #2 09-10-2019, 11:15 PM

are you both original owners?

A holesaw on an extension can dramatically change the sound of a muffler...

dadysev · #3 09-11-2019, 07:19 AM

No but I’m guessing it’s oem. I’ve done work on both like, valley pan gaskets and valve cover gaskets.

ard · #4 09-11-2019, 09:17 PM

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

dadysev · #5 09-11-2019, 10:24 PM

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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