02-28-2019, 05:14 AM | #1 |
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335D Dual exhaust OEM conversion
>>Scroll to last page for final pics<<
I decided to write a little thread as it might help those wishing to do a full 340i exhaust swap. I don't like welding nor chopping my original 335d exhaust as I prefer to keep things stock. Most of the reviews and threads are about people getting just the 340i back box or custom back section welded on.. The 340 exhausts are widely available on ebay, where I got mine for a bargain price, due to people upgrading to a Mpower exhaust system. On my car I'm fitting the full 340i exhaust system with zero welding required, mostly plug and play jobby using original parts. The only modifications required are a 340i rear exhaust hangers, Left & Right. ( cost around 30£ each) Rubber mounts can be re used and are of the same part number. Also you need the front exhaust gearbox mount ( around 40£) and thats it. My work is still in progress as I am awaiting on parts from BMW and most importantly an exhaust reducer pipe, as 340i is 80mm and 335d is 70mm pipeing. The exhaust valve will be completely removed and I have some carbon Akrapovic tail tips to go an aswell. Below are some of the pictures of the current progress. Stand by for more photos and the finished product as soonest I get the rest of the parts required. * Exhaust swap is really easy, and it takes around 10m to remove the existing exhaust. Even easier if you have a helping hand, but if not, the gearbox jacks will do the job. Here you can see the mounts are different. Ordering a 340i mount will resolve the issue and preserve the original exhaust mounts. The DPF downpipe is just a flexi pipe which is hanging loose in the photo. I have ordered an exhaust reducer pipe 80mm to 73mm which will fit perfectly into both exhaust pipes allowing for a smooth connection. More picture to follow soon when the exhaust will be complete. thanks for watching! Last edited by xpro; 03-22-2019 at 02:14 PM.. |
02-28-2019, 01:05 PM | #5 |
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02-28-2019, 02:12 PM | #7 |
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On the petrol cars, the cats are in the downpipes which are before the long exhaust sections. The "boxes" in the exhaust are resonator sections to reduce the noise.
http://www.realoem.com/bmw/enUS/part...BMW-340i&mg=18
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03-01-2019, 04:51 AM | #10 | |
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They mostly range 100-300£ for full exhaust. For me I budget on 150£ all in, and thats me doing the labour. Most peeps on here pay 300/500£ just have a custom pipes welded, etc. This is a plug & play job. If you have an access to a car lift, even better. To answer the question on the DPF and the exhaust material, regen and heat generation. Both exhaust systems are made out of identical stainless T304 metal and the petrol 340i exhaust is much more free flowing then a sister diesel exhaust, which in theory will make the hot DPF gases flow out quicker, and having 1 less cat in the middle should definately improve things( Only Euro 6 Lci Models apprently have a cat after the dpf). The 340i only has a non restrictive resonator in the middle. |
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03-01-2019, 09:48 AM | #11 | |
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The 340i exhaust would only improve flow rate if the 335d one was causing a restriction to the flow after the dpf. If there is any improvement in that respect it will be negligible. I noticed no difference and I have no back box. |
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03-01-2019, 10:15 AM | #12 | |
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Not all models 335D’s are Euro 6 emissions model, so not all are fitted with a catalytic converter post DPF, so theoretically you will downgrade a car to a Euro 5 standard. 12/13/14 plate 335D are all euro 5’s anyway. For me, and from my experience, I’d gladly remove all those systems, as they are chocking the car full stop. The 340i pipe hasn’t got any restrictions in the exhaust, apart from resonators which means the gas will free flow and will not be trapped inside the exhaust. The stainless material is the same, same tickness but wider diameter. On the petrol turbo cars likes of 340i, etc EGT temperature will hit 400/500 celcuis on full tilt anyway, as petrol cars run much hotter then diesels. 335D runs around 300c averagely and only up to 500c for regen process which lasts up to 5/10min. So I dont see any threats at all. When I used to tune MoteC ecus and evos back in the day, the EGT would hit 700c on full boost, to the point where the exhaust would glow red. This kind of temps are simply not achieveable on diesel cars, so I dont think the 340i exhaust will fall apart inside a diesel car. Last edited by xpro; 03-01-2019 at 11:45 AM.. |
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03-01-2019, 11:19 AM | #13 | |
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Interesting thanks. Looks like you have done your homework. Looking forward to hearing about your thoughts on what its like fitted. |
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03-01-2019, 12:43 PM | #14 |
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That's not correct is it? I was always led to believe that all 335d's were Euro 6. It was the 330d that was Euro 5 up until c.2015 before going Euro 6.
Also, only the very recent 340i's will be PPF (July 18). Those before don't have the particulate filter, again this is why there's not an option for the MPPSK on the most recent cars.
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03-01-2019, 04:34 PM | #16 | |
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The exhaust I got was from a 17' 340i. Altought PPF was never a part of the full exhaust system, so I'm not sure when they first introduced it. Must be 18' as you say And for reference 340i and 440i share the identical exhaust set up, same part numbers, etc |
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03-22-2019, 02:14 PM | #17 |
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>>Mission Complete<<
Well chuffed with this job. Exhaust is fitted now. Easy enough job overall, providing you have an access to a car lift, or even easier if you pay an exhaust place to connect it all up for you. The main advantages for me was that I still have my original 335d exhaust that can be refitted in 15 min if it needs be. No cutting, welding, connecting, and destroying your own exhaust, plus this 340i/440i exhaust guarantees OE fitment and correct alignment using original 340i mounts. Other then that the engine sound remains the same. |
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03-23-2019, 02:53 AM | #19 | |
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03-23-2019, 02:55 AM | #20 | ||
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2021 M340i in mineral white, options galore
Previously 2018 440i GC in MG 2015 330D F30 MSport EBII 2012 Alfa Guilietta 2.0d Veloce 2009 Fiat bravo sport 2000 ST Mondeo |
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04-25-2019, 05:20 PM | #22 |
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