Massive drone w. race downpipes?

Underwood · 10-15-2012, 08:16 AM

Hey,

thinking of adding downpipes w. race cats (AR racing) to my setup;

400hp ECU tune, aFe CAI, Eisenmann Race

Do you think drone will become unbearable?
Maybe it will reduce drone?

Lets hear your thoughts and/or experience...

Regards

/H

Acetech · 10-15-2012, 09:02 AM

I have AR catless DPs and there is no drone, the rest of my exhaust is stock 1M. I have no complaints at all

Gtrain · 10-15-2012, 09:08 AM

Midpipes make a big difference. Adding N55 midpipes made a big difference.

oldmarco · 10-15-2012, 10:55 AM

Quote:

Originally Posted by Gtrain

Midpipes make a big difference. Adding N55 midpipes made a big difference.

+1.

On my 135i I used to run 4" catless downpipes and a berk full race exhaust. Had some drone in the 2k rpm area. Once switching back to stock axle back and n55 mid pipes but keeping the 4" downpipes on there is no drone at all.

Mahlzeit · 10-15-2012, 11:25 AM

Keep in mind the 1M very likely has high-flow catted downpipes from the factory. Search around, and you'll find some threads.

1911A145 · 10-15-2012, 01:14 PM

The words "race" and "cat converter" do not belong in the same sentence. lol.

Its pointless to spend the money and the labor to replace a catted converter with another catted converter. The gains will be very minimul and itsnt going to 100% pass a smell test not throw a code. Just go with the cat-less ones and call it a day. youll be fine.

///M1 · 10-15-2012, 04:48 PM

Quote:

Originally Posted by One-emm

Hey,

thinking of adding downpipes w. race cats (AR racing) to my setup;

400hp ECU tune, aFe CAI, Eisenmann Race

Do you think drone will become unbearable?
Maybe it will reduce drone?

Lets hear your thoughts and/or experience...

Regards

/H

Just one thing to keep in mind is that the 1///M has higher flowing cats in its DPs than found in other N54s. So moving to a 'race cat' will lead to smaller gains than you might expect.

So to me at least its either decatted DPs or stock.

robertm · 10-15-2012, 08:20 PM

Go catless all the way through the exhaust. You will love it!! Sounds awesome, no drone and definitely adds power!

Rotor head · 10-16-2012, 12:13 AM

I had the fab speed catless down pipe on and no code, very happy with all stock mids and exhaust. Nice.

Tried adding the mad dad mid pipe in and had terrible drone. Removed the next day. Now I'm waiting for my n55 mid pipe... Anyone had these similar setup ?

Blue55 · 10-16-2012, 01:24 AM

Yes, Maddad with otherwise stock exhaust sounds amazing. Maddad with non-stock muffler = massive DRONE.

Underwood · 10-16-2012, 05:14 AM

A lot of talk around maddad/N55 midpipes. This will not be the case for me, since i already have the Eisenmann full race, with muffled midpipe.

The question then remains - will this setup create massive drone with catless DP's then?

what do you think

robertm · 10-16-2012, 06:16 AM

Don't think it will.

Blue55 · 10-16-2012, 12:34 PM

I doubt it, but you may get a raspy sound that quite a few people find with open DPs. The muffled midpipe may take care of this however.

Underwood · 10-16-2012, 03:51 PM

Quote:

Originally Posted by Blue55

I doubt it, but you may get a raspy sound that quite a few people find with open DPs. The muffled midpipe may take care of this however.

Indeed.

This is science.

MadMan77 · 10-16-2012, 05:22 PM

Wondering if any of you guys with MadDad mid-pipes and are experiencing drone have the resonated version? I am running the resonated version of their mid-pipes and their axle back and have no drone whatsoever.

Now, I know you have a 1M and I have a 135i but I have the same motor and am tuned so not sure why you are droning.

10-15-2012, 08:16 AM	#1
Underwood BMW > Audi+ Merc. Simple math. 34 Rep 149 Posts Drives: 14' Wrangler Join Date: Sep 2011 Location: Schweden iTrader: (0)	Massive drone w. race downpipes? Hey, thinking of adding downpipes w. race cats (AR racing) to my setup; 400hp ECU tune, aFe CAI, Eisenmann Race Do you think drone will become unbearable? Maybe it will reduce drone? Lets hear your thoughts and/or experience... Regards /H __________________ ___________________________________________ Will drive: 2016 M2 Drives: 2014 Wrangler Unlimited with goodies Drove: 2014 M5 Competition Package, 2012 1M, 2010 GT-R
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10-15-2012, 09:02 AM	#2
Acetech Second Lieutenant 219 Rep 275 Posts Drives: 03 M3. 98 M3. 11 1M Join Date: Oct 2009 Location: NY iTrader: (0)	I have AR catless DPs and there is no drone, the rest of my exhaust is stock 1M. I have no complaints at all
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10-15-2012, 09:08 AM	#3
Gtrain Colonel 144 Rep 2,018 Posts Drives: something slowwwww Join Date: Mar 2006 Location: NYC iTrader: (21)	Midpipes make a big difference. Adding N55 midpipes made a big difference.
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10-15-2012, 11:25 AM	#5
Mahlzeit Lieutenant 37 Rep 582 Posts Drives: 1M Join Date: Jul 2007 Location: Location Location iTrader: (0)	Keep in mind the 1M very likely has high-flow catted downpipes from the factory. Search around, and you'll find some threads.
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10-15-2012, 01:14 PM	#6
1911A145 Captain 34 Rep 770 Posts Drives: 135i Join Date: Mar 2012 Location: Port Saint Lucie, FL iTrader: (4)	The words "race" and "cat converter" do not belong in the same sentence. lol. Its pointless to spend the money and the labor to replace a catted converter with another catted converter. The gains will be very minimul and itsnt going to 100% pass a smell test not throw a code. Just go with the cat-less ones and call it a day. youll be fine.
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10-15-2012, 08:20 PM	#8
robertm Major 450 Rep 1,358 Posts Drives: 2020 M2 Comp Join Date: Oct 2007 Location: dfw iTrader: (0)	Go catless all the way through the exhaust. You will love it!! Sounds awesome, no drone and definitely adds power!
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10-16-2012, 12:13 AM	#9
Rotor head Enlisted Member 0 Rep 49 Posts Drives: F10 535 Join Date: Nov 2011 Location: Singapore iTrader: (1)	I had the fab speed catless down pipe on and no code, very happy with all stock mids and exhaust. Nice. Tried adding the mad dad mid pipe in and had terrible drone. Removed the next day. Now I'm waiting for my n55 mid pipe... Anyone had these similar setup ?
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10-16-2012, 01:24 AM	#10
Blue55 Lieutenant 69 Rep 420 Posts Drives: 1M Join Date: May 2009 Location: Earth iTrader: (0)	Yes, Maddad with otherwise stock exhaust sounds amazing. Maddad with non-stock muffler = massive DRONE.
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10-16-2012, 05:14 AM	#11
Underwood BMW > Audi+ Merc. Simple math. 34 Rep 149 Posts Drives: 14' Wrangler Join Date: Sep 2011 Location: Schweden iTrader: (0)	A lot of talk around maddad/N55 midpipes. This will not be the case for me, since i already have the Eisenmann full race, with muffled midpipe. The question then remains - will this setup create massive drone with catless DP's then? what do you think __________________ ___________________________________________ Will drive: 2016 M2 Drives: 2014 Wrangler Unlimited with goodies Drove: 2014 M5 Competition Package, 2012 1M, 2010 GT-R
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10-16-2012, 06:16 AM	#12
robertm Major 450 Rep 1,358 Posts Drives: 2020 M2 Comp Join Date: Oct 2007 Location: dfw iTrader: (0)	Don't think it will.
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10-16-2012, 12:34 PM	#13
Blue55 Lieutenant 69 Rep 420 Posts Drives: 1M Join Date: May 2009 Location: Earth iTrader: (0)	I doubt it, but you may get a raspy sound that quite a few people find with open DPs. The muffled midpipe may take care of this however.
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10-16-2012, 05:22 PM	#15
MadMan77 ↓↓↓ Ex-Con ↓↓↓ 34 Rep 1,874 Posts Drives: Jet Black '08 135i Join Date: Apr 2008 Location: Yigo iTrader: (1)	Wondering if any of you guys with MadDad mid-pipes and are experiencing drone have the resonated version? I am running the resonated version of their mid-pipes and their axle back and have no drone whatsoever. Now, I know you have a 1M and I have a 135i but I have the same motor and am tuned so not sure why you are droning. __________________
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