Did the bg44k do anything?

Blowing exhaust before o2? Cracked manifold? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Blowing exhaust before o2? Cracked manifold? Anyway I can find that out?
But I haven't tried the bk44k yet this posta clean up the injectors right

I don’t know the answer to that aside from a smoke machine up the tailpipe? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Update on my 06 rr supercharged, I just installed brand-new cat on the driver side and 2 upstrream o2 sensor and the issue remains the same ugh, im really pulling off my hair, so I'm doing some search again p0171 I've check almost everything that involves with that cold except fuel related, can someone point to me where the fuel regulator is actually located? And I'm finally going to try that fuel cleaner, any recommendations would help me save this RR please thank you

Have you tried smoke machine in the exhausts and intake looking for leaks? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

I have a smoke machine myself and found nuthing so I thought I'm doing it wrong and so I still brought it to a shop and they also found nuthing too but back then I 1st got the car I filled up the gas all the way and I notice gas was gushing out of the underneath my car, so I never paid attention to it but the code keeps coming back to p0171 and I completely swapped out new parts, except fuel related so I'm gonna start with replacing the fuel pump seal or oring,
So do we have a "fuel pressure regulator" and if we do please share the location I've looked on line nuthing

Appreciate it

Have you tried plugs and coils that side? AFAIK if you are in front of the bonnet with the engine cover off it’s toward the rear on the right - there is a vacuum hos coming from the supercharger piece to it and it had a plug on it a small cube i think Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

P0171 it's telling me the fuel filter and fuel pump could cause this code.
Even the car feels and rides fine can it still throw this code? But I did notice the old fuel filter the previous owner replaced because when I bought the car it was left behind, im gonna replace the pump and filter any other suggestions.
I'll look into that fuel pressure regulator but I was going though images on Google of the fuel filter it looks like there's a fuel pressure regulator underneath the fuel filter is that the one?

Just replaced the fuel pump but check engine remains
Did a search does our car come with a " engine driven fuel pumps" ?
And again where is this fuel pressure sensor on our car, im having a difficult time locating that ugh stressful

Thanks again

Do you have a friend with a similar car?

I'm going to suggest borrowing a petrol cap.

I had that code on my 4.2 SC when I first got it, and also noticed that when I undid the petrol cap it hissed ... I bought a new cap and it has never done it since. 2008 L322 4.2 V8 SC Stornoway Grey
2006 L322 4.2 V8 SC Java Black

What a petrol cap?

The cap that you undo to fill with fuel. 2008 L322 4.2 V8 SC Stornoway Grey
2006 L322 4.2 V8 SC Java Black

Oh mine is brand new from the dealership

Ah, it's not that then  2008 L322 4.2 V8 SC Stornoway Grey
2006 L322 4.2 V8 SC Java Black

Did you fix this? I’m getting issues again now so I’m back on This path - the fuel pressure sensor is under the bonnet on the right has a vacuum hose and a plug going to it Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF