WANTED E90 N53 intermediate exhaust section

Will_460cs · 08-13-2018, 08:20 PM

Looking for a N53 intermediate Exhaust section, so I can cut out the NOX cat..

This is the part from the primary headers to the back back connection and has the secondary cats and Nox cat.

As I am going to remove the NOX cat it would be fine if it has knackered NOX cat...

Tr1ppy · 08-14-2018, 07:00 AM

I thought the secondary cats (boxes next to the gearbox) were the Nox cats anyway?

The Nox sensor is after these secondary (Nox) cats.

The box near the diff is a resonator unless I'm mistaken?

Will_460cs · 08-14-2018, 10:57 AM

I think you are right. Do you have a intermediate section?

Tr1ppy · 08-14-2018, 11:08 AM

I only have a stock backbox from my 330i lying around I'm afraid. I took it off as I had a custom backbox and tailpipes fitted to mine.

Phil325i · 08-15-2018, 06:26 AM

Quote:

Originally Posted by Tr1ppy

I thought the secondary cats (boxes next to the gearbox) were the Nox cats anyway?

No, Will has a 325i, so the NOX cat is after the resonators (near the number 16 in this diagram):

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Tr1ppy · 08-15-2018, 06:49 AM

Ah okay so the box at the back is actually a Nox cat? I thought it was those round ones near number 6 on the diagram lol!

Good job I haven't removed any of them then as I really want to keep the resonators to minimize drone.

BourneJack · 08-15-2018, 07:02 AM

Quote:

Originally Posted by Tr1ppy

I only have a stock backbox from my 330i lying around I'm afraid. I took it off as I had a custom backbox and tailpipes fitted to mine.

+1

Will_460cs · 08-15-2018, 12:51 PM

Really keen to get one of these, Im gutting the lot and welding in new straight pipes.

Will_460cs · 08-15-2018, 09:21 PM

Quote:

Originally Posted by Phil325i

No, Will has a 325i, so the NOX cat is after the resonators (near the number 16 in this diagram):

Attachment 1881375

I’m pretty sure, that :

Number 16 - is the resonator after the resonatir you have the over axle pipe to the back box.

Number 6 - are the secondary cats which have NOX function.

I’m pretty sure it’s this way round as the NOX sensor is before the resonator and temperature sensure is before the cats

I’ll be removing the cats at number 6. Im questioning whether to gut them or replace with straight pipes I think straight pipes will be better..

08-13-2018, 08:20 PM	#1
Will_460cs Lieutenant 209 Rep 461 Posts Drives: E46m3 e91 N53 e90 n55 Join Date: Dec 2011 Location: Cambridgeshire iTrader: (0)	WANTED E90 N53 intermediate exhaust section Looking for a N53 intermediate Exhaust section, so I can cut out the NOX cat.. This is the part from the primary headers to the back back connection and has the secondary cats and Nox cat. As I am going to remove the NOX cat it would be fine if it has knackered NOX cat...
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08-14-2018, 07:00 AM	#2
Tr1ppy Second Lieutenant 36 Rep 278 Posts Drives: E93 330i M Sport Join Date: Mar 2015 Location: North West, UK iTrader: (0)	I thought the secondary cats (boxes next to the gearbox) were the Nox cats anyway? The Nox sensor is after these secondary (Nox) cats. The box near the diff is a resonator unless I'm mistaken?
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08-14-2018, 10:57 AM	#3
Will_460cs Lieutenant 209 Rep 461 Posts Drives: E46m3 e91 N53 e90 n55 Join Date: Dec 2011 Location: Cambridgeshire iTrader: (0)	I think you are right. Do you have a intermediate section?
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08-14-2018, 11:08 AM	#4
Tr1ppy Second Lieutenant 36 Rep 278 Posts Drives: E93 330i M Sport Join Date: Mar 2015 Location: North West, UK iTrader: (0)	I only have a stock backbox from my 330i lying around I'm afraid. I took it off as I had a custom backbox and tailpipes fitted to mine.
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08-15-2018, 06:49 AM	#6
Tr1ppy Second Lieutenant 36 Rep 278 Posts Drives: E93 330i M Sport Join Date: Mar 2015 Location: North West, UK iTrader: (0)	Ah okay so the box at the back is actually a Nox cat? I thought it was those round ones near number 6 on the diagram lol! Good job I haven't removed any of them then as I really want to keep the resonators to minimize drone.
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08-15-2018, 12:51 PM	#8
Will_460cs Lieutenant 209 Rep 461 Posts Drives: E46m3 e91 N53 e90 n55 Join Date: Dec 2011 Location: Cambridgeshire iTrader: (0)	Really keen to get one of these, Im gutting the lot and welding in new straight pipes.
	Appreciate 0 Quote