Catted Downpipe options for N54 z4 35i

BMW764 · 09-05-2023, 09:28 PM

Does anyone have experience with what N54 catted Downpipes work with our z4 E89 sdrive35i? Situation arose where my cat on bank 1 failed and needs replaced. They are expensive so if I’m going to replace I might as well go aftermarket.

From what I found on the internet, Etek makes a Downpipe specifically for e89 but they are expensive.

https://www.etektuning.com/i-3070232...downpipes.html

I’m wondering if VRSF 3" Stainless Steel Catted Downpipes fit since they are half the cost.

https://www.ecstuning.com/b-vrsf-par...xoCEN4QAvD_BwE

Honestly I tried searching the bimmer forum but it kept pulling up all the models and I’m wondering for E89 specifically. So your help here is appreciated!!

B21 · 09-06-2023, 03:32 AM

Most downpipe options that fit E90 cars don't fit E89s..

You need to explicitly check to insure they will fit!

Sachak · 09-08-2023, 09:42 AM

I got a set from an E90, to make it work the exhaust shop had to cut the flanges off the bottom part that connects to the exhaust and weld new flanges at the correct angle else it definitely doesn't fit.

with regards to after market downpipes I don't like them, I had them for a while on my previous E89 and they ruined the engine mount because they simply sit to close to the thing! They get extremely hot and over time they cook the engine mount. Instead what I did was got myself the stock set of E90 downpipes, gutted them and fitted those instead, the power difference was pretty much non existent but now O2 sensors are a breeze to get in and out from the top with a shorty spanner and there are no issues with the engine mount getting cooked.

09-05-2023, 09:28 PM	#1
BMW764 New Member 2 Rep 23 Posts Drives: 2011 BMW Z4 sDrive35i Join Date: Sep 2023 Location: Houston iTrader: (0)	Catted Downpipe options for N54 z4 35i Does anyone have experience with what N54 catted Downpipes work with our z4 E89 sdrive35i? Situation arose where my cat on bank 1 failed and needs replaced. They are expensive so if I’m going to replace I might as well go aftermarket. From what I found on the internet, Etek makes a Downpipe specifically for e89 but they are expensive. https://www.etektuning.com/i-3070232...downpipes.html I’m wondering if VRSF 3" Stainless Steel Catted Downpipes fit since they are half the cost. https://www.ecstuning.com/b-vrsf-par...xoCEN4QAvD_BwE Honestly I tried searching the bimmer forum but it kept pulling up all the models and I’m wondering for E89 specifically. So your help here is appreciated!!
	Appreciate 0 Tweet Quote

09-06-2023, 03:32 AM	#2
B21 Captain 153 Rep 611 Posts Drives: E89 Atacama Yellow 35is Join Date: May 2022 Location: Scotland..God’s own country iTrader: (0)	Most downpipe options that fit E90 cars don't fit E89s.. You need to explicitly check to insure they will fit! __________________ Much modified 2011 Atacama Yellow 35is…previously a much modified 2012 Atacama Yellow 20i MSport Change history here… https://www.dropbox.com/s/8h1vabklgz...0List.pdf?dl=0 Build thread here… https://z4-forum.com/forum/viewtopic.php?t=131886
	Appreciate 0 Quote

09-08-2023, 09:42 AM	#3
Sachak New Member 3 Rep 20 Posts Drives: 2009 E89 Z4 35i sDrive DCT Join Date: Jul 2017 Location: South Africa iTrader: (0)	I got a set from an E90, to make it work the exhaust shop had to cut the flanges off the bottom part that connects to the exhaust and weld new flanges at the correct angle else it definitely doesn't fit. with regards to after market downpipes I don't like them, I had them for a while on my previous E89 and they ruined the engine mount because they simply sit to close to the thing! They get extremely hot and over time they cook the engine mount. Instead what I did was got myself the stock set of E90 downpipes, gutted them and fitted those instead, the power difference was pretty much non existent but now O2 sensors are a breeze to get in and out from the top with a shorty spanner and there are no issues with the engine mount getting cooked.
	Appreciate 0 Quote