what's the difference between resonated and Non-resonated?

Mark Chen · 04-26-2007, 03:04 PM

I am confuse with them
anybody can give me adefineation?

ehhhwik · 04-26-2007, 03:21 PM

a resonator is sort of like a mini-muffler and its between the cat converter and the muffler, it sort of a silencer to make the exhaust note less loud

LOLrance · 04-26-2007, 03:51 PM

Non resonated just means either the exhaust has no resonators or that they removed the resonators. Just remove resonators and weld in straight pipes.

Mark Chen · 04-26-2007, 04:22 PM

thanks a lot!!

ulises 335i · 04-30-2007, 04:28 PM

does it make a big differance if you remove the resonator? is it for sound only or will it provide any power gains?

LOLrance · 04-30-2007, 06:01 PM

Quote:

Originally Posted by ulises 335i

does it make a big differance if you remove the resonator? is it for sound only or will it provide any power gains?

Does it make a big difference sound wise or power wise? If were talking about sound, it really depends on the car. Some people see a huge improvement on the tone of their car. But this doesn't seem to be the case with the e9x. Search for soundclips, i know theirs a few floating around somewhere with stock exhaust resonator removed. IMO most people wont even be able to tell a difference. Power wise, you wont be seeing gains from it, although your butt dyno might make you think their is. Its pretty much for sound (or lack of)

Holygrail · 04-30-2007, 08:37 PM

Question. So if I'm going with a full custom exhaust system, I shouldn't even add the resonator, right? It would make sense not to especially if it has no gains other than sound. I'm not sure how much weight I'll save but I would hope I can at least shed a few pounds.

Holygrail · 04-30-2007, 08:54 PM

I forgot to ask...I know many aftermarket companies are still designing exhaust systems, but are there any aftermarket exhaust brand names you can recommend that I should look out for? Thanks.

WilyB · 04-30-2007, 09:06 PM

Quote:

Originally Posted by Holygrail

I forgot to ask...I know many aftermarket companies are still designing exhaust systems, but are there any aftermarket exhaust brand names you can recommend that I should look out for? Thanks.

Tons of them are. A quick search will get you more names you can count on your two hands. You might even have to enlist your feet!

LOLrance · 04-30-2007, 09:35 PM

Quote:

Originally Posted by Holygrail

I forgot to ask...I know many aftermarket companies are still designing exhaust systems, but are there any aftermarket exhaust brand names you can recommend that I should look out for? Thanks.

Personally, i love Supersprint, Eisenmann, Dixis, Amuse. Most of these companies already have something out for the e9x's (maybe except amuse) but these are VERY pricey.

If your going custom then there is no need for resonators.

uberschnell · 05-01-2007, 12:38 PM

The resonator on the 335 e90 is non-baffled and acts as an x-pipe. I installed a cat back system that eliminated the second cats, resonator, and had flow-thru mufflers. I found the exhaust note on this car is naturally low, and it can create a situation where the low frequencies transmit to the cabin and get amplified at certain RPM levels.
I’m not sure what part the resonators play in reducing/eliminating frequencies or muffling sound. I do believe that type (baffled or straight thru), length, and diameter can be used to eliminate specific frequencies.
I think the mufflers and cats play a larger role in quieting sound then the resonators. Even though a lot of people here are doing it, I’d be careful about removing a resonator to increase exhaust sound. You may get a little more sound and a lot more vibrations, plus, they don’t restrict the flow nearly as much as the stock mufflers, cats, and poorly bent piping.

04-26-2007, 03:04 PM	#1
Mark Chen Colonel 134 Rep 2,889 Posts Drives: 11' E93 M3 LMB Join Date: Oct 2005 Location: Taipei iTrader: (1) Garage List 2011 BMW E93 M3 [0.00]	what's the difference between resonated and Non-resonated? I am confuse with them anybody can give me adefineation? __________________ 11' LMB E93///M3 KW V3 / 19" BBS LM DB-SLD 20th limited edition / AP Racing Pro 5000+ BBK / Akrapovic Evolution Line Exhaust / Arkym Rear Diffuser /Dinan Stage 2 Engine Transmission software
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04-26-2007, 03:21 PM	#2
ehhhwik Brigadier General 126 Rep 3,431 Posts Drives: 09' BMW 335d, 07' BMW E92 328i Join Date: Oct 2006 Location: Vancouver, BC iTrader: (5)	a resonator is sort of like a mini-muffler and its between the cat converter and the muffler, it sort of a silencer to make the exhaust note less loud __________________ Current: 09' E90 335d - Titanium Silver/Black Leatherette/Sports Package/6AT Paddle Shift/USB Integration/19" Staggered Breyton GT Gloss Black Retired: 07' E92 328i (Jet Black)
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04-26-2007, 03:51 PM	#3
LOLrance The Law. 325 Rep 14,282 Posts Drives: BMW Join Date: Apr 2005 Location: SF / OC iTrader: (17)	Non resonated just means either the exhaust has no resonators or that they removed the resonators. Just remove resonators and weld in straight pipes. __________________
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04-26-2007, 04:22 PM	#4
Mark Chen Colonel 134 Rep 2,889 Posts Drives: 11' E93 M3 LMB Join Date: Oct 2005 Location: Taipei iTrader: (1) Garage List 2011 BMW E93 M3 [0.00]	thanks a lot!! __________________ 11' LMB E93///M3 KW V3 / 19" BBS LM DB-SLD 20th limited edition / AP Racing Pro 5000+ BBK / Akrapovic Evolution Line Exhaust / Arkym Rear Diffuser /Dinan Stage 2 Engine Transmission software
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04-30-2007, 04:28 PM	#5
ulises 335i these cars waste alot of fucking gas 57 Rep 992 Posts Drives: 335i montego blue Join Date: Jan 2007 Location: el monte, c.a. iTrader: (3)	does it make a big differance if you remove the resonator? is it for sound only or will it provide any power gains?
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04-30-2007, 08:37 PM	#7
Holygrail Private First Class 25 Rep 127 Posts Drives: 2008 BMW E90 335i Join Date: Jul 2006 Location: NJ and VA iTrader: (0) Garage List 2008 335i Sedan [0.00]	Question. So if I'm going with a full custom exhaust system, I shouldn't even add the resonator, right? It would make sense not to especially if it has no gains other than sound. I'm not sure how much weight I'll save but I would hope I can at least shed a few pounds. __________________ 2008 335i Sedan: Met blk, Blk Lthr w/ pop wood, Sp pkg, Pr Pkg, Cold Pkg, Navi, Sat Radio, Carb Fiber Fr Lo lips and roudrels, Tints (20%), Clear Bra (360 degrees-incl doors), Blackline Tails, red calipers. 18x8.5 & 9.5 Ruff Racing Staggered wheels (saved 6-7 lbs/wheel, CP-E Custom Exhaust system, SS-Turbo Tuner, KN&N, CDV. Future mods: 6-spd Illum Lthr Short Shifter, Eibach Anti-roll bars
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04-30-2007, 08:54 PM	#8
Holygrail Private First Class 25 Rep 127 Posts Drives: 2008 BMW E90 335i Join Date: Jul 2006 Location: NJ and VA iTrader: (0) Garage List 2008 335i Sedan [0.00]	I forgot to ask...I know many aftermarket companies are still designing exhaust systems, but are there any aftermarket exhaust brand names you can recommend that I should look out for? Thanks. __________________ 2008 335i Sedan: Met blk, Blk Lthr w/ pop wood, Sp pkg, Pr Pkg, Cold Pkg, Navi, Sat Radio, Carb Fiber Fr Lo lips and roudrels, Tints (20%), Clear Bra (360 degrees-incl doors), Blackline Tails, red calipers. 18x8.5 & 9.5 Ruff Racing Staggered wheels (saved 6-7 lbs/wheel, CP-E Custom Exhaust system, SS-Turbo Tuner, KN&N, CDV. Future mods: 6-spd Illum Lthr Short Shifter, Eibach Anti-roll bars
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05-01-2007, 12:38 PM	#11
uberschnell Brigadier General 702 Rep 4,081 Posts Drives: Wide Body 1 Join Date: Mar 2007 Location: Bay Area iTrader: (48)	The resonator on the 335 e90 is non-baffled and acts as an x-pipe. I installed a cat back system that eliminated the second cats, resonator, and had flow-thru mufflers. I found the exhaust note on this car is naturally low, and it can create a situation where the low frequencies transmit to the cabin and get amplified at certain RPM levels. I’m not sure what part the resonators play in reducing/eliminating frequencies or muffling sound. I do believe that type (baffled or straight thru), length, and diameter can be used to eliminate specific frequencies. I think the mufflers and cats play a larger role in quieting sound then the resonators. Even though a lot of people here are doing it, I’d be careful about removing a resonator to increase exhaust sound. You may get a little more sound and a lot more vibrations, plus, they don’t restrict the flow nearly as much as the stock mufflers, cats, and poorly bent piping.
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