Euro 4 doesn’t require a DPF:

https://www.theaa.com/driving-advice...ions-standards

The AA site states "some Euro 4 diesel cars were fitted with particulate filters." Their perspective would be Europe (EU & EFTA countries, as well as others that might also have followed Euro 4 at the same time as Europe).

Europe (as of 2013/2014) is at Euro 6. Australia requires Euro 5 and is currently studying if they would adopt Euro 6. As Australia mostly follows, but with a different implementation schedule - a Australian E53 diesel may be "OK" at Euro 3, regardless of production year - but it's your country & you can educate us.

A European E53 3.0 d from January 2005 would need to be a Euro 4 car, which would have included a regulated DPF (at least on automatic cars, which also had the infamous swirl flaps. Manual E53 diesels didn't have intake swirl flaps). Prior to this, the car can be retrofit with an unregulated DPF (which is what I recently did) - which allows an Euro 3 standard 3.0 d to qualify for the green German emissions sticker (not required to drive in nearly all of the top 50+ big cities of Germany). Other countries of Europe (Netherlands, France, etc.) have enacted similar standards. Switzerland considered it, but the large city concentration isn't comparable.

It was assumed for years that e53 2005 diesels would be fitted with swirl flaps-
But everyone who actually looks for them on their e53 finds they don’t exist:

https://www.bmw-driver.net/forum/showthread.php?t=19293

A good thing right?

https://xoutpost.com/bmw-sav-forums/...irl-flaps.html

???Does my X5 have swirl flaps???

Mine is 6-speed ZF 2006 - no swirl flaps, no DPF-
But mine is Australian delivery-
But how does it explain UK e53s not having swirl flaps and DPF?
I don’t know about Switzerland, perhaps you can educate us by finding an example of an e53 with swirl flaps?

@ Deep Blonde:

Please give me the last 7 digits of the car's VIN. This forum represents owners all around the world - RHD cars may indeed be different (exhaust to clear the steering gear) and emissions (AUS vs. Europe).

Swirl flaps. Per my previous note (in Europe), M57 with manual transmissions do NOT have swirl flaps. M57 with automatic DO. M57N should have them on both manual and automatic cars. When i doubt, and a friend asks, we use the VIN for that car. The specific cars you know could have been modified (removal or retrofit to non swirl intake manifolds). I've seen similar information on French and German language forums. If you don't have swift flaps, consider this to be one less thing to sort out on your E53 vs. rear axle carrier bushings, torque rod bushings, final stage resistors or rear tail light contacts :)

DPF. Two examples of the E53 DPF system, which will depend on the year and the factory exhaust system you have. Once again, my perspective is Europe and the LHD world (as this is where I live). It should be the same for a RHD car unless there may be a specific clearance issue for exhaust (something I know from my old 2002 days - but that is not THIS forum).

183 PS cars (M57) can be retrofit with the BMW original part (made by Eberspacher, I used this) or from Twintec - pricing is similar between teh two. This is for an unregulated DPF.

https://www.ebay.de/itm/NACHR%C3%9CS...53.m1438.l2649

218 PS cars (M57N) would use a flanged, regulated DPF. It looks like this current ebay.de auction.

https://www.ebay.de/itm/Katalysator-...53.m1438.l2649

If you have a build list (BMW Archive site can help), you would look for S200A option (particle filter)

Hoping this helps, but please give me a VIN or two of cars you know - I'm intrigued.

For Unique X5's question on the exhaust side question. I've seen in France and another country where an E53 3.0d owner installed a take-off system from a 4.8is. He gained the twin exhaust and neat looking oval outlet aspect, the sound was nice (at least on the video). As this was done with original BMW parts - no homolgation or technical inspection issues. A twin system from a 4.4 or 4.6 would be another alternative, and even easier to source.

Sound was naturally sporty, which is what the owner was targeting. From memory, it naturally required some cutting and welding - I don't recall that it was too complicated.

As E53 cars age, and cars are parted out, this would be an appropriate and economical means to do this - if you are targeting a sport exhaust for your E53.

There was a good Youtube sequence of a fellow in France who did this with a 4.8, can't locate but this is with a 4.6 exhaust on a 3.0d.

https://www.youtube.com/watch?v=VrPGuxzWuW0

Others who had the same idea.

https://www.youtube.com/watch?v=VnBW6Cx2dvQ

https://www.youtube.com/watch?v=0N2QNPGF9Bk

Swirl flaps
If you can find a VIN number of an e53 with swirl flaps we can look it up..
Auto or manual, no e53 has been found to have them.
Anywhere.
It should say ‘flap control’ if it has swirl flaps-
Swirl flaps

This UK forum (and people can make mistakes) would indicate an E53 could have them.

https://www.bimmerforums.co.uk/forum...flaps-t194529/

Of the ~8 E53 I've seen here (Switzerland) in detail and poked around to see option and other differences- most are V-8. Of 3 diesels I've seen, no swirl flaps, but it was to look for the dashpot and rod as a reference to know if mine would have this (182 PS with 5 speed manual) back when I bought the year ~7 years ago. They were all early cars like mine (M57 not M57N). In my case it was one less item to worry about compared to the typical E53 items: rear air springs, tension rod bushings, front ball joint, final stage resistor, rear axle carrier bushings, update breather to vortex style, etc.

For a new buyer (of a used car), it's an awareness issue - look and check.

On the DPF issue - the build option (if from the factory) is S200A. Hope the recent post (and sample German Ebay.de auctions) help you. If you can post good photos or diagrams (realoem.com) of your specific exhaust system - I can share more to assist.

For deepblonde and any others who asked - what does the retrofit DPF look like?

My signature will tell you most but to recap. European 2002 X5 3.0 d (M57) 135 kW (184 PS). It is Euro 3. The factory system includes a diesel catalyzer, is entirely welded (no flanged cat or rear section).
This diagram shows the original front section:

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

Retrofit of the diesel cat to a DPF (I had a very attractive deal on the OEM BMW DPF part) involves cutting just back of the cat and removal (perhaps an hour). The retrofit instructions exist as a PDF file, only in German, I can share but am not certain about the copyright requirements. In all cases, if you aren't familiar with German, the diagrams are quite sufficient.

Pictures of the installed DPF attached, I used the factory retrofit clamp kit (about 40€).

My 2004 auto doesn’t have swirl flaps or dpf. Does have a cat though.

I’ve often wondered whether the 4.4i exhaust would be a simple cost effective “upgrade” for the diesel, or whether it would potentially actually be more restrictive due to the need to quieten a petrol n/a engine, over a turbo diesel?! Would make sense to be better though, being that the 4.4i has more hp *shrug* I’ve still got to find time to chop out my cat converter in the hope of picking up a bit more power.

Thank you for the pics; I think you’re right about DPF being fitted to euro e53s.
Or perhaps they were retrofitted to comply as you have done?
But not UK spec.
2006 e53 diesel full exhaust- no DPF:
https://rover.ebay.com/rover/0/0/0?m...2F173476219098