Akropovic slip on too quiet! + secondary cat delete+ pics+video!!!!!!!

OMRITIME · 05-31-2013, 12:32 PM

So I have the aa dp and loved the sound aspeacly the "grrrrr" at first and second gear when I down shift
I got a nice deal on the akrapovic stainless steel slip on.
I install it last week
And I'm kind of disappointed its sound quiet
It's more bass but that's it ,all the way up to high revs it's the same note
I don't know what to do
I'm thinking on secondary cat delete, I will do it tomorrow but I'm not sure if its help

I'm afraid to admit but I think the stock sound better

With the akropovic I feel more power the car less restricted at lower rev but where is the sound gone?!

I don't know what to do now

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135Pats · 05-31-2013, 12:35 PM

I think? Akra slip on is just the axle back mufflers right? If so yank out the midpipes and swap them with something more aggressive, I think meisterschaft makes straight piping for the mids, not positive if they do it for E92 but I'd imagine so. Catless DPs+GThaus catless mids+Akrapovic mufflers.....That would be quite nice OP. But yea, Akra is not known for being super loud on most automobile platforms, it's more of a refined tone, and obviously the quality if just off the charts.

OMRITIME · 05-31-2013, 12:55 PM

I think the mid pipe will be waste of money
And will make a lot of drone
What u think on the secondary cat delete ,shuold help?

I bought 2500usd muffler And the stock one sound better

Quote:

Originally Posted by 135Pats

I think? Akra slip on is just the axle back mufflers right? If so yank out the midpipes and swap them with something more aggressive, I think meisterschaft makes straight piping for the mids, not positive if they do it for E92 but I'd imagine so. Catless DPs+GThaus catless mids+Akrapovic mufflers.....That would be quite nice OP. But yea, Akra is not known for being super loud on most automobile platforms, it's more of a refined tone, and obviously the quality if just off the charts.

skinrock · 05-31-2013, 01:16 PM

Definitely a tame exhaust, but it was a noticeable improvement over stock. 5000+ RPM is where it really shines, a much more exotic note.

sickem · 05-31-2013, 01:22 PM

Quote:

Originally Posted by OMRITIME

I think the mid pipe will be waste of money
And will make a lot of drone
What u think on the secondary cat delete ,shuold help?

I bought 2500usd muffler And the stock one sound better

I could be wrong here, but I don't think E92s have secondary cats. I know they don't have resonators...just an x pipe

Edit: ^^this is wrong lol

135Pats · 05-31-2013, 01:47 PM

Well if you're really worried about drone, it's going to be tough to get an aggressive sounding exhaust setup. Deleting the secondary cats will make it sound more aggressive, but you'll also have more drone. And doing that will essentially be the same as aftermarket catless mids, except not quite as free flowing since the OE pipes have some un-necessary bends in them. The Akra has mufflers on it, so I personally wouldn't be super concerned about drone or rasp with straight piping from the turbos to the mufflers...but this is all subjective. The only factual statement I can give you is that aggressive exhausts almost always have significant drone and rasp on N54s. It's just the nature of FI motors, the sound will always trend towards a boomy/drony tone when you remove muffling/cats/resonators.

OMRITIME · 05-31-2013, 02:44 PM

Quote:

Originally Posted by 135Pats

Well if you're really worried about drone, it's going to be tough to get an aggressive sounding exhaust setup. Deleting the secondary cats will make it sound more aggressive, but you'll also have more drone. And doing that will essentially be the same as aftermarket catless mids, except not quite as free flowing since the OE pipes have some un-necessary bends in them. The Akra has mufflers on it, so I personally wouldn't be super concerned about drone or rasp with straight piping from the turbos to the mufflers...but this is all subjective. The only factual statement I can give you is that aggressive exhausts almost always have significant drone and rasp on N54s. It's just the nature of FI motors, the sound will always trend towards a boomy/drony tone when you remove muffling/cats/resonators.

So
If I remove the resonators it will be drony?!
And become louder?!

135Pats · 05-31-2013, 02:50 PM

Quote:

Originally Posted by OMRITIME

So
If I remove the resonators it will be drony?!
And become louder?!

Resonator delete=more rasp, more drone, more loud. Whether that is desireable depends on the end user of course. But i'm not well versed on the E92 exhaust design, so I'm not even sure if you have resonators to begin with. IIRC the E92 is more aggressive sounding than the E90 from the factory.

marcus321 · 05-31-2013, 02:54 PM

Quote:

Originally Posted by 135Pats

Resonator delete=more rasp, more drone, more loud. Whether that is desireable depends on the end user of course. But i'm not well versed on the E92 exhaust design, so I'm not even sure if you have resonators to begin with. IIRC the E92 is more aggressive sounding than the E90 from the factory.

e90 comes with a resonator, e92 do not. I would remove the 2 secondary cats and add some resonators in place. I added 2 vibrant resonators and the sound is much better to me now. I too have a DP and a axle back exhaust(Remus). I love the sound now

ken1137 · 05-31-2013, 03:09 PM

+1...get rid of the secondary cats to mimmic the straight pipe as you see with the mid section from Akrapovic. Add resonator to tame the drone.

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imo...the Akrapovic only sounds good with a V8 (M3) or the M5. GL!

C ///M · 05-31-2013, 11:08 PM

I heard a full Akrapovic exhaust on a 1M and it was by far the best sounding N54 I've ever heard. But the 1M exhaust is much different than the 3er versions (2 into 1 before the rear axle).

OMRITIME · 05-31-2013, 11:16 PM

Quote:

Originally Posted by ken1137

+1...get rid of the secondary cats to mimmic the straight pipe as you see with the mid section from Akrapovic. Add resonator to tame the drone.

Attachment 870380

imo...the Akrapovic only sounds good with a V8 (M3) or the M5. GL!

I see its straight pipe without resonator and probaly full system doesn't make much different to the drone

So i think I delete the secondary cats
And weld just a straight pipe instead
Hope it work

ken1137 · 05-31-2013, 11:18 PM

Quote:

Originally Posted by OMRITIME

I see its straight pipe without resonator and probaly full system doesn't make much different to the drone

So i think I delete the secondary cats
And weld just a straight pipe instead
Hope it work

Definitely worth a try...GL! post a vid later.

OMRITIME · 06-04-2013, 10:07 AM

so
i made the secondary cat delete
its great and actually it eliminate the drone!!!
the turbo spool feel so fast

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Jeff@TopGearSolutions · 06-04-2013, 10:26 AM

How about a video!?

Blaster400 · 06-04-2013, 10:33 AM

How bad is the smell now that you are completely catless?

TSTARKZ123 · 06-04-2013, 11:06 AM

Quote:

Originally Posted by C ///M

I heard a full Akrapovic exhaust on a 1M and it was by far the best sounding N54 I've ever heard. But the 1M exhaust is much different than the 3er versions (2 into 1 before the rear axle).

I concur! I've yet to hear one on the 335 but the 1M sounds amazing!

OMRITIME · 06-04-2013, 01:29 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

How about a video!?

Coming soon.....

Quote:

Originally Posted by Blaster400

How bad is the smell now that you are completely catless?

Actually bad and a lot of smoke until car getting warm, today someone on the road told me that my car smoking.....
But about the smell I don't really care I don't smell it inside

OMRITIME · 06-05-2013, 02:52 AM

warm start

05-31-2013, 12:32 PM	#1
OMRITIME Lieutenant 82 Rep 596 Posts Drives: M4 Join Date: May 2010 Location: tel-aviv iTrader: (1)	Akropovic slip on too quiet! + secondary cat delete+ pics+video!!!!!!! So I have the aa dp and loved the sound aspeacly the "grrrrr" at first and second gear when I down shift I got a nice deal on the akrapovic stainless steel slip on. I install it last week And I'm kind of disappointed its sound quiet It's more bass but that's it ,all the way up to high revs it's the same note I don't know what to do I'm thinking on secondary cat delete, I will do it tomorrow but I'm not sure if its help I'm afraid to admit but I think the stock sound better With the akropovic I feel more power the car less restricted at lower rev but where is the sound gone?! I don't know what to do now __________________ 2008 e92 335 FBO 2011 e92 M3 ZCP DCT 2015 f82 M4 DCT Last edited by OMRITIME; 06-05-2013 at 03:30 PM.
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05-31-2013, 12:35 PM	#2
135Pats Major General 423 Rep 6,495 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	I think? Akra slip on is just the axle back mufflers right? If so yank out the midpipes and swap them with something more aggressive, I think meisterschaft makes straight piping for the mids, not positive if they do it for E92 but I'd imagine so. Catless DPs+GThaus catless mids+Akrapovic mufflers.....That would be quite nice OP. But yea, Akra is not known for being super loud on most automobile platforms, it's more of a refined tone, and obviously the quality if just off the charts. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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05-31-2013, 01:16 PM	#4
skinrock Agent Smith 224 Rep 3,348 Posts Drives: 2016 i8 Join Date: Jan 2011 Location: The Matrix iTrader: (9) Garage List 2016 BMW i8 [5.00]	Definitely a tame exhaust, but it was a noticeable improvement over stock. 5000+ RPM is where it really shines, a much more exotic note.
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05-31-2013, 01:47 PM	#6
135Pats Major General 423 Rep 6,495 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	Well if you're really worried about drone, it's going to be tough to get an aggressive sounding exhaust setup. Deleting the secondary cats will make it sound more aggressive, but you'll also have more drone. And doing that will essentially be the same as aftermarket catless mids, except not quite as free flowing since the OE pipes have some un-necessary bends in them. The Akra has mufflers on it, so I personally wouldn't be super concerned about drone or rasp with straight piping from the turbos to the mufflers...but this is all subjective. The only factual statement I can give you is that aggressive exhausts almost always have significant drone and rasp on N54s. It's just the nature of FI motors, the sound will always trend towards a boomy/drony tone when you remove muffling/cats/resonators. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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05-31-2013, 03:09 PM	#10
ken1137 Brigadier General 78 Rep 3,727 Posts Drives: a slow 2009 e90 335i Join Date: Jun 2011 Location: Chicago iTrader: (7) Garage List 2009 e90 335i [3.20]	+1...get rid of the secondary cats to mimmic the straight pipe as you see with the mid section from Akrapovic. Add resonator to tame the drone. imo...the Akrapovic only sounds good with a V8 (M3) or the M5. GL! __________________ BMWCCA member
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05-31-2013, 11:08 PM	#11
C ///M Lieutenant 30 Rep 491 Posts Drives: '07 X3 M-Sport Join Date: May 2010 Location: Chicago iTrader: (2) Garage List 2007 BMW X3M Prototype [5.00]	I heard a full Akrapovic exhaust on a 1M and it was by far the best sounding N54 I've ever heard. But the 1M exhaust is much different than the 3er versions (2 into 1 before the rear axle). __________________ Prototype 2007 Monaco E83 'X3M' \| N54 Swap \| Dual Cone \| VRSF CP & DPs \| CXR Intercooler \| ER Dual Oil Coolers \| Dual 2.5" w/X-Pipe \| M3 Rear Exhaust \| 20" BC Forged HB05 \| Michelin PSS 265 & 305 \| F10 M5 & F80 M3 Brakes \| KW Variant 2 \| H&R Swaybars \| TMS Z4M Camber Arms \| Z4 Finned Diff \| BMW Perf. Grills w/Tri-Color \| Custom M Aerodynamics \| CF Trim \| M Perf. Carbon Shift & Handbrake Knobs \| BMW Perf. SS Pedals \| M3 Dead Pedal \| V1 Hardwired \| Int LEDs \| Umnitza Orion v4 AE & More
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06-04-2013, 10:07 AM	#14
OMRITIME Lieutenant 82 Rep 596 Posts Drives: M4 Join Date: May 2010 Location: tel-aviv iTrader: (1)	so i made the secondary cat delete its great and actually it eliminate the drone!!! the turbo spool feel so fast __________________ 2008 e92 335 FBO 2011 e92 M3 ZCP DCT 2015 f82 M4 DCT
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06-04-2013, 10:26 AM	#15
Jeff@TopGearSolutions BimmerPost Supporting Vendor 2795 Rep 60,920 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	How about a video!? __________________ \|Like us on Facebook\|\|Evolution Racewerks\| \|Active Autowerke\| \|ETS\| \|Burger Tuning\| \|PURE Turbos\| \|Mishimoto\|\|VRSF\| \|AWE\| \|Wagner\| \|2019 New Year Sale!\| \|KW\| \|Spec\| \|ST Coilovers\| \|Koni\| \|Bilstein\| \|Borla\| \|Magnaflow\| \|AFE\| \|Fabspeed\| \|Injen\| Up to 10% Off!
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06-04-2013, 10:33 AM	#16
Blaster400 Captain 108 Rep 840 Posts Drives: 2007 335i E92 BSM 6AT Join Date: Jul 2012 Location: Birmingham, MI iTrader: (3) Garage List 2007 335i E92 [4.91] 2018 Porsche Macan [0.00] 2012 X3 Xdrive 35i [0.00]	How bad is the smell now that you are completely catless? __________________ MOTIV 750 ST \| MOTIV PI \| 100% E85 \| Fuel-it Stage 4 LPFP \| MOTIV Boost Box + MHD Protune \| Quaife \| Öhlins \| Brembo \| Akrapovic
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06-05-2013, 02:52 AM	#19
OMRITIME Lieutenant 82 Rep 596 Posts Drives: M4 Join Date: May 2010 Location: tel-aviv iTrader: (1)	warm start __________________ 2008 e92 335 FBO 2011 e92 M3 ZCP DCT 2015 f82 M4 DCT
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