Exhaust idea: input appreciated

GreenPlease · 08-01-2009, 11:20 AM

So with my car going in for some body work, I'm thinking I should kill a few birds with one stone and do suspension, DPs, and exhaust all at once. I'm tired of waiting for the AMS exhaust so I was thinking of this setup:

-AR Design catted DPs
-Custom dual exhaust, 3" pipe
-Retain secondary cats (I know it hurts performance, my choice)
-X pipe
-No muffler

I'm thinking that between the turbos and cats the exhaust shouldn't be too loud. Not having any muffler should save weight and might even be lighter than the AMS system not to mention it should be very free flowing. The X pipe is in there to cancel out drone, though I haven't found a good resourse as to where in the system it needs to be.

What do you guys think?

NM_BMW · 08-01-2009, 11:23 AM

I don't know if there is room to do dual 3" pipe. Why go that big anyways?

AR pipes for sure!

No x-pipe. Put some resonators to help with the drone.

What suspension you going with?

GreenPlease · 08-01-2009, 11:27 AM

Good catch, dual 2.5" then? I'm thinking of KW Street Comforts but I'm pretty open at this point. I've heard amazing things about the Koni FSD/Eibach combo.

Zeph · 08-01-2009, 12:19 PM

KW V1 is just as good as V2 or V3 unless you are planning to fine tune to your preferences. Unless you are on the GT circuit I think KW V1 lowered past stock a bit and properly corner balanced will be fine and not too expensive.

GreenPlease · 08-01-2009, 12:32 PM

Any other thoughts on the exhaust idea? I thought an x pipe could be used to cancel out drone

:

Sniz · 08-01-2009, 01:35 PM

just buy the AE exhaust.....much less headache.

flem · 08-01-2009, 01:37 PM

Quote:

Originally Posted by Sniz

just buy the AE exhaust.....much less headache.

some people don't consider doing custom work a headache

GreenPlease · 08-01-2009, 02:18 PM

Quote:

just buy the AE exhaust.....much less headache.

I considered that but I'd really like to do something unique. Plus, I want to minimize weight, maximize flow, and stay legal.

TMR · 08-01-2009, 03:17 PM

Run a single 3" all the way to a 3" in dual out muffler Like AMS. I did mine that way at it sounds AWESOME with no power decrease

GreenPlease · 08-01-2009, 03:22 PM

@TMR

How'd you get the exhaust to merge from the downpipes? Are you running two tips or just one?

Zeph · 08-02-2009, 07:29 PM

Quote:

Originally Posted by GreenPlease

@TMR

How'd you get the exhaust to merge from the downpipes? Are you running two tips or just one?

Just look at the AMS exhaust. Sounds like what you want, design-wise anyway (except custom and cheaper).

Sniz · 08-02-2009, 07:50 PM

Quote:

Originally Posted by flem

some people don't consider doing custom work a headache

I'm one of em!!

but its hard to know what sound you are going to get when going the full custom route.

dvpouldar26 · 08-02-2009, 07:56 PM

Try some Aero AR20 resonators to get rid of the design. Great choice with the AR design Dp's.

TMR · 08-02-2009, 08:15 PM

http://www.e90post.com/forums/showthread.php?t=255620

Here are some pictures. I changed the system a bit. Now the 2.5" goes almost to the bend before it starts to convert to 3" and its almost 12" long now. This system sounds amazine. MANY compliments on the sound. Inside the car its really quiet. Im actually going to look into have another muffler made only smaller to see if it sounds a little louder.

Fraggy · 08-02-2009, 08:59 PM

Quote:

Originally Posted by GreenPlease

I've heard amazing things about the Koni FSD/Eibach combo.

I wouldnt go that far... Its good, but thats about it. Ive owned it.

08-01-2009, 11:20 AM	#1
GreenPlease Lieutenant Colonel 129 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	Exhaust idea: input appreciated So with my car going in for some body work, I'm thinking I should kill a few birds with one stone and do suspension, DPs, and exhaust all at once. I'm tired of waiting for the AMS exhaust so I was thinking of this setup: -AR Design catted DPs -Custom dual exhaust, 3" pipe -Retain secondary cats (I know it hurts performance, my choice) -X pipe -No muffler I'm thinking that between the turbos and cats the exhaust shouldn't be too loud. Not having any muffler should save weight and might even be lighter than the AMS system not to mention it should be very free flowing. The X pipe is in there to cancel out drone, though I haven't found a good resourse as to where in the system it needs to be. What do you guys think?
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08-01-2009, 11:23 AM	#2
NM_BMW Vishnu Powered 68 Rep 2,205 Posts Drives: 335xi, S1000RR Join Date: Nov 2007 Location: Proceding iTrader: (7)	I don't know if there is room to do dual 3" pipe. Why go that big anyways? AR pipes for sure! No x-pipe. Put some resonators to help with the drone. What suspension you going with? __________________ 2008 335xi Sedan \| Titanium Silver \| Black Dakota PROcede v5 \| Vishnu Exhaust \| BMS DCI \| AR Catless DPs \| Helix FMIC \| Stett Charge w/ Tial BOV \| MORR VS8s \| KWv3
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08-01-2009, 11:27 AM	#3
GreenPlease Lieutenant Colonel 129 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	Good catch, dual 2.5" then? I'm thinking of KW Street Comforts but I'm pretty open at this point. I've heard amazing things about the Koni FSD/Eibach combo.
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08-01-2009, 12:19 PM	#4
Zeph Major 27 Rep 1,410 Posts Drives: 2008 E92 335i 6MT SGM CR/BD Join Date: Jul 2008 Location: Southeast USA iTrader: (0)	KW V1 is just as good as V2 or V3 unless you are planning to fine tune to your preferences. Unless you are on the GT circuit I think KW V1 lowered past stock a bit and properly corner balanced will be fine and not too expensive.
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08-01-2009, 12:32 PM	#5
GreenPlease Lieutenant Colonel 129 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	Any other thoughts on the exhaust idea? I thought an x pipe could be used to cancel out drone :
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08-01-2009, 01:35 PM	#6
Sniz Lieutenant General 658 Rep 10,587 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	just buy the AE exhaust.....much less headache. __________________
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08-01-2009, 03:17 PM	#9
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	Run a single 3" all the way to a 3" in dual out muffler Like AMS. I did mine that way at it sounds AWESOME with no power decrease
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08-01-2009, 03:22 PM	#10
GreenPlease Lieutenant Colonel 129 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	@TMR How'd you get the exhaust to merge from the downpipes? Are you running two tips or just one?
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08-02-2009, 07:56 PM	#13
dvpouldar26 Major 64 Rep 1,498 Posts Drives: 2008 e92 328i, Porsche 987.1 Join Date: May 2008 Location: Beverly Hills, CA iTrader: (4)	Try some Aero AR20 resonators to get rid of the design. Great choice with the AR design Dp's. __________________ E92 328i Jet Black / Gloss Black Grilles / 8000k D1S low beam / 6000k HID fogs / GP Thunder 8500k angels & cornering bulbs / black reflectors / gloss black vinyled window trim / tints / smoked rear turn signals / black roundels / AC Schnitzer roof spoiler / VRS style decklid spoiler / Matte black Stripes / Rear fogs / matte mirrors / 19" LM reps / APR lip
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08-02-2009, 08:15 PM	#14
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	http://www.e90post.com/forums/showthread.php?t=255620 Here are some pictures. I changed the system a bit. Now the 2.5" goes almost to the bend before it starts to convert to 3" and its almost 12" long now. This system sounds amazine. MANY compliments on the sound. Inside the car its really quiet. Im actually going to look into have another muffler made only smaller to see if it sounds a little louder.
	Appreciate 0 Quote