Replacing Midpipe Cats with Resonators

.. · 08-21-2014, 12:37 PM

Hey guys,

Looking to replace my Midpipe Cats with equivalent sized resonators.

Anyone have any links to resonators they have used in replacement of the N54 secondary cats?

I want to be sure the resonators I order will fit in replacement.

Thanks,
Durim

Grinchxvx · 08-21-2014, 01:47 PM

Ar20 or maybe ar25z.

.. · 08-21-2014, 03:13 PM

Quote:

Originally Posted by Grinchxvx

Ar20 or maybe ar25z.

Do I need to order a specific size?

Grinchxvx · 08-21-2014, 06:33 PM

Just find out what size the tubing is I think it's around 2.5 inches and order them I think they're 50 each, that's what a lot of e46 m3 dudes put in their midpipes to get rid of rasp and make their exhaust deeper.

fredy · 08-21-2014, 06:38 PM

2.25 inches the oem pipe

.. · 08-21-2014, 07:39 PM

Quote:

Originally Posted by Grinchxvx

Just find out what size the tubing is I think it's around 2.5 inches and order them I think they're 50 each, that's what a lot of e46 m3 dudes put in their midpipes to get rid of rasp and make their exhaust deeper.

Quote:

Originally Posted by fredy

2.25 inches the oem pipe

If they really are 2.25" then Aero doesn't care that size.

Only 2" 2.5" and 3"

ShocknAwe · 08-21-2014, 08:19 PM

http://www.ebay.com/itm/2-25-x-12-OA...2e2558&vxp=mtr

Grinchxvx · 08-21-2014, 08:28 PM

You could get a 2" and maybe expand the end with one of those machines that exhaust shops have? (Can't remember the name)

Grinchxvx · 08-21-2014, 08:32 PM

While were on the subject of exhausts and e46 m3's:
Anyone know how to make a 135i sound similar to a m3? I miss the raspy scream of my old car so much. I'm thinking straight pipe to get the rasp

ShocknAwe · 08-21-2014, 08:37 PM

Your turbos are acting as mufflers. So if you had an exhaust on your old M3 you'll probably never get it to work out like that.

If you want rasp, full catless straight pipe will do it.

Grinchxvx · 08-21-2014, 09:33 PM

Cool just what I figured

.. · 08-21-2014, 09:48 PM

Quote:

Originally Posted by ShocknAwe

http://www.ebay.com/itm/2-25-x-12-OA...2e2558&vxp=mtr

Thanks for the link!

Is 12" too long?

ShocknAwe · 08-24-2014, 05:16 PM

Quote:

Originally Posted by DurimOne54

Thanks for the link!

Is 12" too long?

NP!

No idea honestly. I'd get under there and measure the lengths of the straights in the midpipe section.

.. · 08-24-2014, 09:46 PM

Quote:

Originally Posted by ShocknAwe

NP!

No idea honestly. I'd get under there and measure the lengths of the straights in the midpipe section.

12" seems to be perfect.

Let's wait to hear how it sounds.

Currently have Berk Race Axle-back, BMS Cat-Less down pipes and the stock Mids.

Also, this OEM resonator, should I delete it and replace with straight pipe or keep it?

ShocknAwe · 08-24-2014, 09:52 PM

Quote:

Originally Posted by DurimOne54

12" seems to be perfect.

Let's wait to hear how it sounds.

Currently have Berk Race Axle-back, BMS Cat-Less down pipes and the stock Mids.

Also, this OEM resonator, should I delete it and replace with straight pipe or keep it?

HMM. You know, I might put a Y-pipe resonator delete in there while you're having the secondaries cut out and the vibrants welded in. Since you're mufflerless though, hard to say. It would be nice to see how much the vibrant res reduces rasp in the exhaust note compared to the stock y-pipe resonator. I haven't messed with my mids at all aside from trying the N55 midpipe so let us know how it goes.

.. · 08-24-2014, 10:03 PM

Quote:

Originally Posted by ShocknAwe

HMM. You know, I might put a Y-pipe resonator delete in there while you're having the secondaries cut out and the vibrants welded in. Since you're mufflerless though, hard to say. It would be nice to see how much the vibrant res reduces rasp in the exhaust note compared to the stock y-pipe resonator. I haven't messed with my mids at all aside from trying the N55 midpipe so let us know how it goes.

I'll weld in the resonators first and see how I like it.

I'm sure even with the replacement of the cats with resonators the car will be louder.

ShocknAwe · 08-24-2014, 10:15 PM

Quote:

Originally Posted by DurimOne54

I'll weld in the resonators first and see how I like it.

I'm sure even with the replacement of the cats with resonators the car will be louder.

A before/after vid would be awesome if you have the time to do so.

.. · 08-24-2014, 10:19 PM

Quote:

Originally Posted by ShocknAwe

A before/after vid would be awesome if you have the time to do so.

Yessir will do!

Pics and videos to come

Grinchxvx · 08-24-2014, 11:19 PM

I want to see this too! I just got downpipes in so midpipes next

darkrom · 08-25-2014, 07:17 AM

The Maddad midpipe is exactly that, with the ideal resonators IMO.

Check into it. That midpipe is my only exhaust mod, and it'll probably stay that way. First car I haven't done a full exhaust on in my life, but I absolutely love the sound and OEM black tips.

.. · 08-25-2014, 09:20 AM

Quote:

Originally Posted by darkrom

The Maddad midpipe is exactly that, with the ideal resonators IMO.

Check into it. That midpipe is my only exhaust mod, and it'll probably stay that way. First car I haven't done a full exhaust on in my life, but I absolutely love the sound and OEM black tips.

Those are $700 and have the same diameter of the stock midpipes (2.25") so basically all you're paying for are the resonators....

The logic is not there.

darkrom · 08-25-2014, 10:19 AM

I just wanted a quality high end part with the PERFECT sound. I got that. I think it was worth it vs hacking up the stock mids in case I want to sell the car etc.

You can certainly add resonators to the stock cats. What you are trying will work, but then its cutting welding and buying high end quality resonators (hopefully) to get the sound you want. And if you don't like the sound what would you do buy another set of resonators and pay someone to cut and weld those in?

Labor factored into the price on my setup. The maddad pipe bolted in easy as could be.

08-21-2014, 12:37 PM	#1
.. Lieutenant 62 Rep 581 Posts Drives: 135i Join Date: Mar 2013 Location: Somewhere iTrader: (0)	Replacing Midpipe Cats with Resonators Hey guys, Looking to replace my Midpipe Cats with equivalent sized resonators. Anyone have any links to resonators they have used in replacement of the N54 secondary cats? I want to be sure the resonators I order will fit in replacement. Thanks, Durim __________________ 08' Sparkling Graphite Metallic E82 135i. 6spd Manual.
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08-21-2014, 01:47 PM	#2
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	Ar20 or maybe ar25z. __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-21-2014, 06:33 PM	#4
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	Just find out what size the tubing is I think it's around 2.5 inches and order them I think they're 50 each, that's what a lot of e46 m3 dudes put in their midpipes to get rid of rasp and make their exhaust deeper. __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-21-2014, 06:38 PM	#5
fredy Private First Class 14 Rep 100 Posts Drives: 135i Join Date: Sep 2010 Location: canada iTrader: (0)	2.25 inches the oem pipe
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08-21-2014, 08:19 PM	#7
ShocknAwe 1Addict 3231 Rep 7,890 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	http://www.ebay.com/itm/2-25-x-12-OA...2e2558&vxp=mtr __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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08-21-2014, 08:28 PM	#8
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	You could get a 2" and maybe expand the end with one of those machines that exhaust shops have? (Can't remember the name) __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-21-2014, 08:32 PM	#9
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	While were on the subject of exhausts and e46 m3's: Anyone know how to make a 135i sound similar to a m3? I miss the raspy scream of my old car so much. I'm thinking straight pipe to get the rasp __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-21-2014, 08:37 PM	#10
ShocknAwe 1Addict 3231 Rep 7,890 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	Your turbos are acting as mufflers. So if you had an exhaust on your old M3 you'll probably never get it to work out like that. If you want rasp, full catless straight pipe will do it. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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08-21-2014, 09:33 PM	#11
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	Cool just what I figured __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-24-2014, 11:19 PM	#19
Grinchxvx Lieutenant 29 Rep 414 Posts Drives: 2008 135i Join Date: Apr 2014 Location: Salt Lake City iTrader: (0)	I want to see this too! I just got downpipes in so midpipes next __________________ 2008 Aw/Coral Red Manual 135i Coupe- JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.]
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08-25-2014, 07:17 AM	#20
darkrom Colonel 188 Rep 2,224 Posts Drives: 135i Join Date: Feb 2011 Location: Rhode Island iTrader: (5)	The Maddad midpipe is exactly that, with the ideal resonators IMO. Check into it. That midpipe is my only exhaust mod, and it'll probably stay that way. First car I haven't done a full exhaust on in my life, but I absolutely love the sound and OEM black tips.
	Appreciate 0 Quote

08-25-2014, 10:19 AM	#22
darkrom Colonel 188 Rep 2,224 Posts Drives: 135i Join Date: Feb 2011 Location: Rhode Island iTrader: (5)	I just wanted a quality high end part with the PERFECT sound. I got that. I think it was worth it vs hacking up the stock mids in case I want to sell the car etc. You can certainly add resonators to the stock cats. What you are trying will work, but then its cutting welding and buying high end quality resonators (hopefully) to get the sound you want. And if you don't like the sound what would you do buy another set of resonators and pay someone to cut and weld those in? Labor factored into the price on my setup. The maddad pipe bolted in easy as could be.
	Appreciate 0 Quote