Has anybody cut open an E90 resonator (Not rear mufflers)?

bradsm87 · 03-01-2016, 03:40 AM

I'm looking to improve exhaust flow and wondering if anybody has cut open the E90 resonator (The one that's different to the E92 X-pipe)?

The pipe layout is kinda weird and it'd be interesting to know what's going on in there. It'd be easy to tell if there are gains in changing it if we could see it.

davidwarren · 03-01-2016, 07:02 AM

Quote:

Originally Posted by bradsm87

I'm looking to improve exhaust flow and wondering if anybody has cut open the E90 resonator (The one that's different to the E92 X-pipe)?

The pipe layout is kinda weird and it'd be interesting to know what's going on in there. It'd be easy to tell if there are gains in changing it if we could see it.

I've seen it before. Both sides remain separate and have perforations in the pipe to reduce sound. They don't cross over.

b1mmr · 03-01-2016, 07:19 AM

Quote:

Originally Posted by davidwarren

Quote:

Originally Posted by bradsm87

I'm looking to improve exhaust flow and wondering if anybody has cut open the E90 resonator (The one that's different to the E92 X-pipe)?

The pipe layout is kinda weird and it'd be interesting to know what's going on in there. It'd be easy to tell if there are gains in changing it if we could see it.

I've seen it before. Both sides remain separate and have perforations in the pipe to reduce sound. They don't cross over.

Technically if they are both sealed in there and have perforations then pressures could equalize to some degree.. Although that's nothing even remotely close to the result an xpipe would offer.. Just potentially worth noting

I still wish I didn't have mine cut out so I could have just replaced my secondary cats and put in glasspacks for mufflers and end up slightly quieter... Ah well.

bradsm87 · 03-02-2016, 05:18 AM

Thanks.

Bump for pics

Sered · 03-02-2016, 04:03 PM

Quote:

Originally Posted by bradsm87

I'm looking to improve exhaust flow and wondering if anybody has cut open the E90 resonator (The one that's different to the E92 X-pipe)?

The pipe layout is kinda weird and it'd be interesting to know what's going on in there. It'd be easy to tell if there are gains in changing it if we could see it.

I'd replace the exhaust if you're wanting to improve exhaust flow, or remove the secondaries at least (Assuming you've got downpipes). You're not going to get anything tangible out of any of the muffler/resonator parts flow-wise.

davidwarren · 03-02-2016, 04:44 PM

Quote:

Originally Posted by bradsm87

Thanks.

Bump for pics

I made you this incredibly accurate reproduction of the inside of the resonator.

bradsm87 · 03-02-2016, 06:34 PM

Thanks guys. I'll wait to hear from Doug at FrankenTurbo regarding backpressure improvement after removing secondary cats then decide between that and doing a custom 3.5" single system.

Mixmaster · 03-03-2016, 06:04 PM

I am looking at doing the same but not for flow just acoustics. I did the pe mod to an e92 exhaust and found it stupid loud. So thinking if I I just do the resonators on my e91 exhaust it should just be a slight bump in sound

bradsm87 · 03-03-2016, 07:42 PM

Quote:

Originally Posted by Mixmaster

I am looking at doing the same but not for flow just acoustics. I did the pe mod to an e92 exhaust and found it stupid loud. So thinking if I I just do the resonators on my e91 exhaust it should just be a slight bump in sound

I personally wouldn't remove the resonator. You can do the PE mod, but just cover half of the perforated holes instead of all of them on the right side muffler only and leave the left side as-is and leave the exhaust valve intact.

Mixmaster · 03-03-2016, 08:46 PM

Quote:

Originally Posted by bradsm87

I personally wouldn't remove the resonator. You can do the PE mod, but just cover half of the perforated holes instead of all of them on the right side muffler only and leave the left side as-is and leave the exhaust valve intact.

A stock e92 exhaust is the same as the e90 but an x pipe instead of the resonator though yeah?

bradsm87 · 03-04-2016, 07:10 PM

Yeah true. In that case, no sound gain at all from deleting that. Making the banks separated just makes it sound horrible.

b1mmr · 03-05-2016, 02:24 AM

Quote:

Originally Posted by bradsm87

Yeah true. In that case, no sound gain at all from deleting that. Making the banks separated just makes it sound horrible.

Xpipe in place of the res with the flap open definitely sounds different (better) on my e90.

https://www.instagram.com/p/-nqoJhReQz/

bradsm87 · 03-05-2016, 06:44 PM

Quote:

Originally Posted by Ian_N54

Xpipe in place of the res with the flap open definitely sounds different (better) on my e90.

https://www.instagram.com/p/-nqoJhReQz/

Yeah X-pipe could be good. I interpreted that question as that person having an E92 so it would be a bad idea to delete the x-pipe.

stephenf121 · 03-05-2016, 07:23 PM

Sorry to thread jack, but I was wondering if anyone has tried downpipes + secondary cat delete + resonator delete (x-pipe)? i currently have catless downpipes but it is too quite for my taste. Would deleting the secondary cats and adding an x-pipe in place of the resonator give a good sound? I haven't heard a video with all three mods done

b1mmr · 03-06-2016, 02:30 AM

Quote:

Originally Posted by stephenf121

Sorry to thread jack, but I was wondering if anyone has tried downpipes + secondary cat delete + resonator delete (x-pipe)? i currently have catless downpipes but it is too quite for my taste. Would deleting the secondary cats and adding an x-pipe in place of the resonator give a good sound? I haven't heard a video with all three mods done

All over youtube

davidwarren · 03-16-2016, 04:37 PM

Quote:

Originally Posted by Ian_N54

Xpipe in place of the res with the flap open definitely sounds different (better) on my e90.

https://www.instagram.com/p/-nqoJhReQz/

what did you pay for the xpipe install?

b1mmr · 03-18-2016, 07:21 AM

Quote:

Originally Posted by davidwarren

Quote:

Originally Posted by Ian_N54

Xpipe in place of the res with the flap open definitely sounds different (better) on my e90.

https://www.instagram.com/p/-nqoJhReQz/

what did you pay for the xpipe install?

It was 45 bucks.. Dudes are cool.. Place down the road from them charged 85 for tips... Never again

bloppitybloop · 03-18-2016, 07:58 AM

Quote:

Originally Posted by stephenf121

Sorry to thread jack, but I was wondering if anyone has tried downpipes + secondary cat delete + resonator delete (x-pipe)? i currently have catless downpipes but it is too quite for my taste. Would deleting the secondary cats and adding an x-pipe in place of the resonator give a good sound? I haven't heard a video with all three mods done

Add the x-pipe. It will give you a bit more sound. I have catless DP's and x-pipe and it sounds better than having the stock resonator.

bloppitybloop · 03-18-2016, 08:00 AM

Quote:

Originally Posted by Ian_N54

It was 45 bucks.. Dudes are cool.. Place down the road from them charged 85 for tips... Never again

Wow, that's a great price. I paid about double that but my choices here are limited. Half the population here drives a prius so...

b1mmr · 03-19-2016, 05:28 AM

Quote:

Originally Posted by reckedhim

Quote:

Originally Posted by Ian_N54

It was 45 bucks.. Dudes are cool.. Place down the road from them charged 85 for tips... Never again

Wow, that's a great price. I paid about double that but my choices here are limited. Half the population here drives a prius so...

Ouch, that wouldn't bother me as much for the xpipe considering they redid that whole area.. 80 for tips stung a bit.. They claimed the metal there was hard and chewed up blades.....

Move over, I've got a Dewalt AND and welder...

Plus some shops don't seem to like doing custom work.. As in your muffler isn't busted so why are you here? My money is as green as everyone else's, if not greener.

03-01-2016, 03:40 AM	#1
bradsm87 Lieutenant Colonel 603 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Has anybody cut open an E90 resonator (Not rear mufflers)? I'm looking to improve exhaust flow and wondering if anybody has cut open the E90 resonator (The one that's different to the E92 X-pipe)? The pipe layout is kinda weird and it'd be interesting to know what's going on in there. It'd be easy to tell if there are gains in changing it if we could see it.
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03-02-2016, 05:18 AM	#4
bradsm87 Lieutenant Colonel 603 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Thanks. Bump for pics
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03-02-2016, 06:34 PM	#7
bradsm87 Lieutenant Colonel 603 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Thanks guys. I'll wait to hear from Doug at FrankenTurbo regarding backpressure improvement after removing secondary cats then decide between that and doing a custom 3.5" single system.
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03-03-2016, 06:04 PM	#8
Mixmaster Private First Class 28 Rep 99 Posts Drives: 335i E90 N54 / 2014 i3 REX Join Date: Nov 2013 Location: Auckland iTrader: (0)	I am looking at doing the same but not for flow just acoustics. I did the pe mod to an e92 exhaust and found it stupid loud. So thinking if I I just do the resonators on my e91 exhaust it should just be a slight bump in sound __________________ N54 E91 Msport Wagon, VRSF 7"FMIC, VRSF DPs, BMS OCC, BMS DCI, RB PC Valve, Wavetrac LSD, MHD Wedge , ER Charge Pipe, Nuke Performance Bov, MMP Inlets, Fuel-It Stage 2 Bucketless
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03-04-2016, 07:10 PM	#11
bradsm87 Lieutenant Colonel 603 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Yeah true. In that case, no sound gain at all from deleting that. Making the banks separated just makes it sound horrible.
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03-05-2016, 07:23 PM	#14
stephenf121 Second Lieutenant 43 Rep 206 Posts Drives: 2007 335i Join Date: Oct 2015 Location: Ohio iTrader: (0)	Sorry to thread jack, but I was wondering if anyone has tried downpipes + secondary cat delete + resonator delete (x-pipe)? i currently have catless downpipes but it is too quite for my taste. Would deleting the secondary cats and adding an x-pipe in place of the resonator give a good sound? I haven't heard a video with all three mods done
	Appreciate 0 Quote