This site uses cookies and other tracking technologies to assist with navigation and your ability to provide feedback, analyse your use of our products and services, assist with our promotional and marketing efforts, and provide content from third parties.

ECOTUNE BMW E46 320D Decat Downpipe

ECOTUNE BMW E46 320D Decat Downpipe

(1 review) Write a Review

Need Some Advice? Speak to one of our experts.

PLEASE NOTE: Whilst we do hold limited stock of our Ecotune downpipes, if this item is out of stock it is made to orderPlease allow up to 10 working days from time of order. 

Fits all E46 320D models regardless of year.
This is a direct replacement for the standard catalytic convertor and downpipe that are fitted to the car from the factory. This downpipe will not interfere with any sensors or cause any ECU faults. If you are unsure or require assistance, please don't hesitate to contact us, we will be delighted to assist.
Stainless Steel Downpipe
Built for performance, economy and longevity!

Performance - You will enjoy reduced turbo lag and a noticeable performance difference throughout the entire rev range! The original downpipe has a near 90 degree angle into a restrictive "heat soaked" cat which is replaced with a smooth bend and unnecessary under bonnet heat is reduced. Turbo lag is reduced and the reduction in turbo temperatures has a direct effect on the air intake temperature. This promotes a cleaner burn and with the correct software, a higher power remap can be applied safely in the knowledge that your turbocharger is running cooler.
Economy - You will experience around a 2 MPG improvement over the original restrictive catalytic convertor depending on your driving style due to the reduction in your turbo and intake temperatures.
Longevity - Your upgraded dowpipe is over-engineered in 316 Marine Grade stainless steel and the flexible coupling in 304 Grade stainless steel, your new downpipe should outlast the life of your vehicle. You should also expect your turbocharger to have a longer life as temperatures are greatly reduced.
Perfect Fit - This downpipe was carefully developed using the Genuine BMW factory item as a template then improvements were made to flow where possible.
Noise - The only difference to the sound from your exhaust is a very gentle whistle from your now de-restricted turbocharger. This in no way has an effect on the exhaust note.
Quality - Built with over 20 years experience in all kinds of fabrication and welding you can be assured that the quality of your new performance downpipe will be second to none!
Guarantee - A lifetime guarantee is offered on the pipework and as the uprated stainless steel coupling is a flexible part, we offer a two year warranty on the flexi section.

Trade in – We offer a £45 trade-in on our old genuine BMW part! Simply send your old part back to us, include a note with your name and your contact details. We will inspect your old part, make sure it is genuine. Once we have done this, we will refund the £45 back to the bank details you paid with. If you have any questions, please don’t hesitate in contacting us! We are happy to help.

Write a Review

1 Customer Review Hide Reviews Show Reviews

  • Perfect for what I need

    Posted by Jamil Choudory on 20th Jul 2020

    I bought this for my E46 320D 2004 Saloon and it was a direct fit. Taking out the old one was the main problem but fitting this back in was perfect. It lined up everything correctly and fit how it should. The item came how it should, had nice weld beads on it and everything looked the part. I noticed it didn't come with any original mounting parts but I guess it didn't need it as once it's all screwed in, it's all held in place and it's a lot lighter than original. I would suggest buying new bolts from dealership or Ebay as the old ones are probably on it's way out - this goes for the mid pipe side and the turbo side of things.

    Moving on to sound... so they say it doesn't make a difference and it probably wouldn't make a difference if you had everything else standard, however this was not my case and I pretty much have a straight through. I can say that it doesn't drone which I'm thankful for but it definitely doesn't sound like a diesel. Its loud and does get a lot of attention but it suits the look of the car. It's not obnoxious but its loud when the turbo goes into full boost which helps with performance. There is a massive difference in free power after doing this. What I mean is that I can feel nothing restricting my engine anymore or my turbo. Temperatures of my turbo has dropped lower too which helps it run cooler and more efficiently.

    I'm sure economy has been affected however, expect it to drop as you're gonna put your foot down to hear the car open up xD

    So theres questions about MOT and will it pass. Now they will not find much difference within your emission test, however on the visual check they'll be able to see your turbo cat has been removed. I've remedied this by purchasing some flexible heat shield and temporary covering the visual sight of the cat so they can't see if it's still there or not. However do not take my word for this method, it has just worked for me and you should always follow legal rules for your car to be road worthy.

    All in all it's been great having this downpipe and I appreciate the communication you guys had with me and keeping me updated with everything. I know it was difficult during Covid-19 but still came fairly quick. Thanks again guys and hope this review helps anyone who comes across it.

Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Related Products

Contact & Phone Orders

Ecotune UK Ltd.
Unit 10, 36 Dalziel Road,
Hillington Park Industrial Estate,
G52 4NN
Call us: 0141 882 4669

Shop with Confidence

SagePay & PayPal Payments

Finance Available

Call our team to discuss financing by Klarna.