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      06-08-2012, 03:59 PM   #1
BURAKUSTA
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2k Rpm Drone Please Help

I have eisenmann race with catless x-pipe.While the sound is amazing in higher rpm's it is not nice at low rpm's.I usually stay between 2k-2.5 on the freeway so i need your help here.I still have primary cats on the car.My question is if i delete them and put oem secondary cats to my x-pipe,can i eliminate drone ???
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      06-08-2012, 04:12 PM   #2
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I'm not an expert but I'm going to say no. Getting an xpipe is just going to worsen it.
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      06-08-2012, 05:09 PM   #3
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Drive faster or slower lol. Gotta pay to play
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      06-08-2012, 05:12 PM   #4
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wow, u only drive at 2k on fwy. Drive Faster or sell car and get 328 with exhaust....
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      06-08-2012, 11:54 PM   #5
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If you could eliminate the drone on an Eisenmann Race you'd be a God...there's nothing you could do short of replacing it would eliminate the drone. But man, what a sound!
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      06-09-2012, 05:33 AM   #6
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I even get drone with the Eisenmann Sport & Challenge sport around 2000-2200. Not much, but it's there. If it's bothersome, downshift or get in the throttle to get out of that band.
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      06-09-2012, 08:08 AM   #7
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Buy an akra evolution

But heck I'm so sensitive to loud exhaust I think even that drones at 2,5k. Im told that's just more bass in the tone but the slight vibration I get on my nut sack tells me it's drone
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      06-09-2012, 11:42 AM   #8
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Hilarious!!! No audible drone, but palpable by ........
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      06-09-2012, 02:24 PM   #9
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2-2.5K on the freeway is pretty damn slow.

I don't think the M3 was made to cruise that slowly on the freeway.

- KJ
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      06-10-2012, 08:11 PM   #10
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Add this to your X pipe!

http://www.magnaflow.com/02product/02glasspack.asp

Yess! GlassPack
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      06-11-2012, 12:31 AM   #11
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OP, if you can find an exhaust shop that can find some space for two Heimholtz chambers like on the AA, it'll drastically cut the drone, nut is pretty tight ba k there with the Eisenmann's huge can. Another option would be to weld in some resonators into the connecting pipes, but that'll mellow out the exhaust in general a little too.

Quote:
Originally Posted by Bob MG View Post
Buy an akra evolution

But heck I'm so sensitive to loud exhaust I think even that drones at 2,5k. Im told that's just more bass in the tone but the slight vibration I get on my nut sack tells me it's drone
It does drone at the same RPM range but it's tolerable. It's crazy loud on a Race exhaust.

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2-2.5K on the freeway is pretty damn slow.

I don't think the M3 was made to cruise that slowly on the freeway.

- KJ
It's about 70mph with DCT, which is about what traffic flows at in the OC. LA is even slower.

.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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      06-11-2012, 09:41 AM   #12
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OP google Heimholtz chambers; theres some really good write ups from the Pontiac G8 forums about how to build your own and eliminate drone.
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      06-11-2012, 10:01 AM   #13
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Catless x-pipe + Eisenmann Race = not sure what you expected.
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      06-13-2012, 11:29 AM   #14
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2k RPM on the highway is like 55-60mph? isn't it? -.- Your M3 is doing a favour by trying to bother you with the drone
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      06-13-2012, 11:43 AM   #15
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As others have said, either cruise at a faster speed/lower gear for higher RPM or your current exhaust setup isn't for you.
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      06-13-2012, 12:26 PM   #16
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I have just bought akrapovic evolution system without muffler,so my setup will be akrapovic from headers to eisenmann race mufflers.We will see how it goes.
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      06-13-2012, 12:43 PM   #17
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Quote:
Originally Posted by BURAKUSTA View Post
I have just bought akrapovic evolution system without muffler,so my setup will be akrapovic from headers to eisenmann race mufflers.We will see how it goes.
Same setup as mine. You'll need to make adapters for it as it will not bolt on.
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      06-13-2012, 01:04 PM   #18
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Quote:
Originally Posted by talontid View Post
OP google Heimholtz chambers; theres some really good write ups from the Pontiac G8 forums about how to build your own and eliminate drone.
Heimholtz chamber mod on rear cans. Pic is for illustration purpose; 350z

http://i1246.photobucket.com/albums/...2/8fe4f07e.jpg
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      06-13-2012, 06:01 PM   #19
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Quote:
Originally Posted by THE TECH View Post
Same setup as mine. You'll need to make adapters for it as it will not bolt on.
Do the included adaptors from Akra not work?

.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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      06-13-2012, 06:36 PM   #20
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The only proven method to eliminate drone on aggressive exhaust setups are side branch resonators..curious why there is not more aftermarket applications for M3s on this..I suspect space and cost may be big factors

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      06-13-2012, 07:35 PM   #21
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Quote:
Originally Posted by THE TECH View Post
Same setup as mine. You'll need to make adapters for it as it will not bolt on.
How is drone on your car when driving between 2k and 3k ? How is the sound can you upload a quick video ?
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      06-14-2012, 09:28 AM   #22
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Quote:
Originally Posted by aus View Post
Do the included adaptors from Akra not work?

.
Correct. You have to have something custom made.
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