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08-21-2014, 12:37 PM | #1 |
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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
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08' Sparkling Graphite Metallic E82 135i. 6spd Manual. |
08-21-2014, 01:47 PM | #2 |
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Ar20 or maybe ar25z.
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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, 03:13 PM | #3 |
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08' Sparkling Graphite Metallic E82 135i. 6spd Manual. |
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08-21-2014, 06:33 PM | #4 |
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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.
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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, 07:39 PM | #6 | |
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Only 2" 2.5" and 3" |
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08-21-2014, 08:19 PM | #7 |
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08-21-2014, 08:28 PM | #8 |
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You could get a 2" and maybe expand the end with one of those machines that exhaust shops have? (Can't remember the name)
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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 |
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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
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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 |
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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.
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08-21-2014, 09:33 PM | #11 |
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Cool just what I figured
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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, 09:48 PM | #12 | |
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Is 12" too long? |
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08-24-2014, 05:16 PM | #13 |
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NP!
No idea honestly. I'd get under there and measure the lengths of the straights in the midpipe section.
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08-24-2014, 09:46 PM | #14 | |
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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? |
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08-24-2014, 09:52 PM | #15 |
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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.
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08-24-2014, 10:03 PM | #16 | |
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I'm sure even with the replacement of the cats with resonators the car will be louder. |
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08-24-2014, 10:15 PM | #17 |
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A before/after vid would be awesome if you have the time to do so.
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08-24-2014, 11:19 PM | #19 |
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I want to see this too! I just got downpipes in so midpipes next
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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 |
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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. |
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08-25-2014, 09:20 AM | #21 | |
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The logic is not there. |
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08-25-2014, 10:19 AM | #22 |
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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. |
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