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  #11  
Old 01-16-2017, 06:13 AM
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I am interested in this. I am not into the welding option as welds can also break and I am thinking that I will do this mod myself. I love the twin pipe look and have always looked at the 4.8is with envy. Yeah I know others have the twins, but the 4.8 is a thing of beauty.

Leads me to a couple of questions.

1. How much soot will I end up with over the back end of the car? I mean mine is black but still I like to keep it clean!

2. Anyone got any measurements or guide where to cut the exhaust before I get my grinder out and get it all wrong?

3. I am thinking of doing the rear sub frame bushes at some point and as you have to fiddle with the exhaust for access, then why not do all of this at the same time!? Surely it will make it easier if I cut the existing exhaust out and then tackle rear sub bushes and then do the exhaust mod.

4. Using the clamps and some of that super exhaust weld magic paste.... any down sides or concerns to me aware of?

Cheers guys and sorry for the TON of questions... but I want to get this done on mine and before I make a mess, its good to get your advice.
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BMW X5 E53 3.0 Diesel Sport | Sapphire Black Dakota Beige Leather interior | Year 2004

What I had updated
Carbon Effect Steering Wheel
Panoramic Sunroof Fix
PVC Replacement
All glowplugs and glowplug regulator
New discs and pads all round
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  #12  
Old 01-16-2017, 08:02 AM
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Yeah well that's your decision. My vehicle is Highland Green and it doesn't show any soot with normal driving. I did tow a trailer half way across Australia and the area around the exhaust tips and a section of the bumper did get coated with soot. The engine was definitely loaded with the extra weight, plus the normal airflow behind the vehicle was altered by the 'boxy' nature of the enclosed furniture trailer. The process is not irreversible regardless of if you use clamps or go the weld option. The mufflers I bought came with a flanged length of pipe and clamps but the exhaust tech ditched them. I fitted mine just on 12 months ago and haven't had any ill effects.
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  #13  
Old 01-16-2017, 08:12 AM
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Cheers Neil, good info, think I am going to go for it this summer and if I make a giant mess of it, I will pay for someone to fix it!
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BMW X5 E53 3.0 Diesel Sport | Sapphire Black Dakota Beige Leather interior | Year 2004

What I had updated
Carbon Effect Steering Wheel
Panoramic Sunroof Fix
PVC Replacement
All glowplugs and glowplug regulator
New discs and pads all round
All new front suspension links, bushes and rods
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  #14  
Old 01-16-2017, 08:42 PM
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So it is a cat converter which I guess is sort of similar to DPF , as in it helps burn un burnt fuel. I see it is single in and twin out. Has anyone got an old diesel muffler spare to cut open to see where the gases go?
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  #15  
Old 01-16-2017, 08:46 PM
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Actually looking at the picture no.1 is the cat with the flange and further down the larger piece that is twin out is the resonator, right?
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  #16  
Old 01-16-2017, 08:55 PM
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Quote:
Originally Posted by Unique X5 View Post
Actually looking at the picture no.1 is the cat with the flange and further down the larger piece that is twin out is the resonator, right?
Not sure what part you have on yours - mine has the large bore header from the turbo feeding into the cat, then twin looonnngggg straight pipes heading back and off to the two rear mufflers, splitting just in front of the rear diff. That's all. And this is what RealOEM shows is standard. Do you have another "something" in the section from the cat to the muffler?

A DPF maybe...?
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  #17  
Old 01-16-2017, 08:57 PM
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Quote:
Originally Posted by Unique X5 View Post
Actually looking at the picture no.1 is the cat with the flange and further down the larger piece that is twin out is the resonator, right?
Oh, hang on - #1 in the image above? No, that's not a cat - it's a flexible joint - nothing more. Just a section of pipe. The cat. is item #4 and includes the long twin pipes running to the back.
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  #18  
Old 01-16-2017, 09:06 PM
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Here's the full images....





A factory fitted DPF system would look like this (pretty rare I'd say though)..



A retro-fitted DPF looks like this (very like a cat - I suspect it is a cat AND a DPF, in one unit)..



HTH...
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  #19  
Old 09-06-2018, 03:49 PM
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The retrofit DPF solution is for E53 3.0 diesel (M57 engine) up to September 2003 production. These cars were all originally equipped with a diesel oxycat. I've installed the retrofit DPF on my car, there are specific retrofit instructions - you cut just past the oxycat (specific length) and install the replacement unit with #2 crush sleeves. It works fine, the car is cleaner (it's needed in Germany to drive in the major cities and a good idea elsewhere). Emissions are Euro 3 level, you do have a lower particulate count with the retrofit DPF.

The other DPF system (with regeneration) was implemented from September 2003 and provides Euro 4 level of emissions (M57N engines). This specific DPF is installed with flange fittings at both ends, so it can be removed, cleaned and reinstalled.

As for the dual exhaust further back - that's another story, related to sound and appearance. I've seen guys in France who have added the 4.6 and 4.8 rear section for the sound and outlets in the rear bumper cover (look on Youtube, you'll find them).
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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.

Last edited by Gregory891; 09-06-2018 at 04:18 PM. Reason: Better information
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  #20  
Old 09-06-2018, 04:22 PM
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You're in Australia and RHD. Not having your specific VIN (to check the build sheet), I could only put the basics in realoem.com

Does your front section look like this?

https://www.realoem.com/bmw/enUS/sho...diagId=18_0461

If so, your car doesn't appear to be a Euro 4 version (which would be standard for a LHD European car).
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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.
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