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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 Thu, Sep-28-2017, 03:00:28 PM   #1
E36Sport
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Default DINAN EXHAUST - Catless Owner's Inside

So I've been living with my current exhaust setup for about 6 months now, its Fabspeed Headers/Stock Sec. 1 & 2./Dinan Sec. 3. It has a wonderful sound at WOT and has ZERO drone but has a pretty significant and dare I say, ugly rasp at 2-3k. I have done my due diligence and searched and also found exactly 1 youtube video with this combination and a rasp pipe but wanted to see if any forum members have resolved the rasp with an AR20, or resonated section 2 or really any solution to combat the rasp. Feedback, sound clips or videos would be greatly appreciated.
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Old Thu, Sep-28-2017, 03:04:02 PM   #2
mercedesc63
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Default Re: DINAN EXHAUST - Catless Owner's Inside

I remember my Dinan muffler and Intake alone used to give me horrible headaches. Dinan drones and even my friend says it who has Dinan on his car.

My Miestershaft Eisenmann Ti section 3 and Eisenmann section 2 never did that and where even louder.
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Old Thu, Sep-28-2017, 03:30:25 PM   #3
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Default Re: DINAN EXHAUST - Catless Owner's Inside

Dinan is well known to be one of the least drone mufflers in line with stock and Supersprint street. So if you have drone ... who knows what shape that muffler was in or why, that isn't typical at all. Obviously nothing is true 100% of the time, but Dinan muffler droning hasn't been the case overall.
For rasp, you're asking the right questions, I'll let those who have solved it respond.

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Old Thu, Sep-28-2017, 04:02:45 PM   #4
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Default Re: DINAN EXHAUST - Catless Owner's Inside

I have headers and a dinan out back
Had 2 200 cell cats section 1 and it was raspy but still deep sounding.

Ar20 in oe section 1 now and it's toned down quite a bit but still have some rasp that's for probably 1000rpm between 3-4k

Maybe I'll add another one


I think every exhaust has a resonating frequency. Even oem does. Dinan is not bad at cruising speeds

Last edited by rpearl555; Thu, Sep-28-2017 at 04:06:09 PM.
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Old Thu, Sep-28-2017, 04:37:58 PM   #5
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Default Re: DINAN EXHAUST - Catless Owner's Inside

At one point, I had catless headers, CPI Rasp pipe section 1(which basically is sect 1 with 2 resonators), stock sect 2, and Dinan 3. It sounded fine, no rasp, fairly tame. I got tired of the smell, so I replaced the 2 resonators with cats in the sect 1. Got a little louder, but still not too bad or raspy.
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Old Thu, Sep-28-2017, 05:19:48 PM   #6
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Default Re: DINAN EXHAUST - Catless Owner's Inside

I've been through 2 Dinan mufflers and both had some drone.

Stock + Dinan, some drone, rasp and not too loud, but not Supersprint (street/sport quiet - whichever their quietest version is).
AP Headers & HFC, different frequency drone, a bit louder, much raspier. Sounds great WOT at higher rpms but lower rpms it's quiet annoying and not the type of rasp I enjoy.
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Old Thu, Sep-28-2017, 05:27:01 PM   #7
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Default Re: DINAN EXHAUST - Catless Owner's Inside

Does anyone know how one or two ar20s in the section 1 affect power/flow? Thinking of adding another ar20 for sure now as this thread reminds me how annoyed I am about the rasp and dinan
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Old Thu, Sep-28-2017, 06:08:44 PM   #8
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Default Re: DINAN EXHAUST - Catless Owner's Inside

The drone isn't the issue, I actually find it quite plesant with the Dinan but the rasp is just ungodly in that specific RPM range, I'd like to find a solution because I think it is one of the best looking and sounding mufflers for our cars.
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Old Thu, Sep-28-2017, 10:35:51 PM   #9
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Default Re: DINAN EXHAUST - Catless Owner's Inside

catalytic converters and resonators are the main controllers of rasp. the less of those you have the more rasp you will get. sec3 contributes very little to controlling rasp on these cars

i would run euro cats if i were you (for a multitude of reasons)
but if you don't want to then just get a sec1 with high quality resonators
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Old Fri, Sep-29-2017, 03:36:08 AM   #10
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Default Re: DINAN EXHAUST - Catless Owner's Inside

Quote:
Originally Posted by rpearl555 View Post
Does anyone know how one or two ar20s in the section 1 affect power/flow? Thinking of adding another ar20 for sure now as this thread reminds me how annoyed I am about the rasp and dinan
Resonators don't affect power/flow - they are straight through. If you have stock US headers/cats - adding one additional resonator gets rid of most of the rasp.
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Discussing Does Your E46 BMW Consume Oil? 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)