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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-08-2012, 12:28:36 AM   #11
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Default Re: Do AR20/25s really work in eliminating rasp?

Yes, they work. My exhaust is completely stock except for one AR20 on one pipe and the stock resonator on the other pipe. I'd say the rasp was reduced 90-95%. You still get a little at high RPM but it's not near as obnoxious as it was before. Just the right amount IMO.
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Old Wed, Feb-08-2012, 12:29:00 AM   #12
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Default Re: Do AR20/25s really work in eliminating rasp?

Was going to do this, but honestly I love the sound of my m with the AP. Nice and loud, great growl to it. Plus wasn't worth it to me, my local muffler guy was kind of shocked I originally wanted him to use such a "cheap"part on my car. He had installed plenty, and he was under the impression they were some cheap resonators (which they are.) At which point I questioned whether or not I personally wanted to drop close to 100 on this mod, and if it bothered me that much. I decided it wasn't worth it and am happy with my decision.
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Old Wed, Feb-08-2012, 01:50:41 AM   #13
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Default Re: Do AR20/25s really work in eliminating rasp?

Quote:
Originally Posted by bimmermilan View Post
Here is what I have experienced. If you run catless then the AR20/25's wont help at all, you will still have rasp. If you run catted with twin AR's then you will get rid of 90% of the rasp. To get rid of all the "RASP" you need to run twin Magnaflow resonators and cats. Video description below.....

http://www.youtube.com/watch?v=Gd56u...2&feature=plcp

Ask me how I know....Lol
What is the difference between Magnaflow resonators and AR20/25s resonators?
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Old Wed, Feb-08-2012, 02:13:55 AM   #14
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Default Re: Do AR20/25s really work in eliminating rasp?

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Originally Posted by iceberq View Post
Yes. I had Agency power muffler with stock everything else. It was loud and raspy.
Installed the extra resonator and suddenly it was too quiet + no rasp.
Then I removed the section 2 resonator to get a little more sound back.
After 500 more miles it got louder and a little bit of rasp started again, but it is now better than when I had just the muffler.

Here is a video of my car, revving inside a partial-open air garage and sitting inside my car
BMW E46 M3 Exhaust Reving (Agency Power Muffler + Modded Section 1 & 2) - YouTube
Iceberg, do you have a drive by video too? I'm running an AP muffler as well and I like your set up, but eventually plan to do catless headers as well.
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Old Wed, Feb-08-2012, 06:50:27 AM   #15
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Default Re: Do AR20/25s really work in eliminating rasp?

Yes they help for sure.
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Old Wed, Feb-08-2012, 05:41:29 PM   #16
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Default Re: Do AR20/25s really work in eliminating rasp?

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Originally Posted by y0c0nsci3nc3 View Post
Iceberg, do you have a drive by video too? I'm running an AP muffler as well and I like your set up, but eventually plan to do catless headers as well.
Unfortunately I don't. I want headers too in the future but I'll pair it up with cats in section 1. That should keep it the rasp back down a bit
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Old Wed, Jan-22-2020, 12:12:08 AM   #17
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Default Re: Do AR20/25s really work in eliminating rasp?

Can I piggy back off of a question here? I have an agency power exhaust system (minus the headers) and itís obnoxiously loud for my taste. How do I know what size resonator I need to install? I hope this isnít a dumb question.
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Old Wed, Jan-22-2020, 12:16:26 AM   #18
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Default Re: Do AR20/25s really work in eliminating rasp?

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Originally Posted by Mkf2020 View Post
Can I piggy back off of a question here? I have an agency power exhaust system (minus the headers) and itís obnoxiously loud for my taste. How do I know what size resonator I need to install? I hope this isnít a dumb question.
First post in 9 years is on a resonator thread from 8 years ago

Good bump!
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Old Wed, Jan-22-2020, 01:29:23 AM   #19
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Default Re: Do AR20/25s really work in eliminating rasp?

Thanks!
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Old Wed, Jan-22-2020, 05:18:20 PM   #20
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Default Re: Do AR20/25s really work in eliminating rasp?

I havent read through the 2 pages of this thread, but want to give my opinion and experience.

I welded a genuine AeroExhaust AR20 into my factory OEM Section 1. The exhaust was still raspy, it did not eliminate it, but it did reduce it somewhat especially down low and in the 2.5-3.5k rpm ear splitting drone range. What I will say it did more than reducing rasp was change the TONE of my exhaust in the upper range. It went from being high pitched and exotic near redline to a deeper more tame sound, it also reduced the overall volume. I ended up missing the original high pitch sound and volume and eventually moved onto to straight pipes and then back to another OEM section 1.

I have a video on my YouTube channel comparing all 3 of these setups.

EDIT: LMAO just saw this thread popped up due to a 8 year old necro thread bump
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Discussing Do AR20/25s really work in eliminating rasp? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)