Stock muffler mod out there?

ScottinSSMD · 10-03-2010, 09:10 AM

Since I was bored yesterday and running without mufflers, I decided to open up a muffler to see what I can or can't do with it. Will most likely pull out the glass and reseal to start with. See where that goes. Also plan to paint the bottom and tips semi-gloss black. I was amazed at how much glass is packed in all the chambers. Once I put these back together, I will remount to see if this was just a waste of time.

ga41 · 10-03-2010, 03:08 PM

Sounds like an interesting project. Maybe post some pictures if you have any?

Trev · 10-03-2010, 03:20 PM

+1 very interested to see what the stocker looks like on the inside.

I've been toying with the idea of running a straight tube internally from the inlet to one of the two tips. By swiss cheesing this tube & using an external bypass valve you'd end up with a dual mode muffler.

Similar to this flowtech design http://www.holley.com/types/Warlock.asp

ScottinSSMD · 10-03-2010, 03:42 PM

Well, I was contemplating a straight pipe but since I have been running muffler-less for the past couple of weeks I decided to do this project. Straight pipe/no pipe is too ricey and loud. Not sure what to expect from this mod but will see tomorrow when I get a chance to remount.

Very easy, really just needed the time during the past 2 days to do this. I first picked the top side due to the welds that would hold the panels in place after I did my cutting. Also, because I did not want any evidence that this had even been done when it is lifted, checked, eyeballed from below.

Picked my lines and cut with a grinder. ABout 20 minutes for each one, tops.

Look how much friggin glass is packed into just one of these!!!!!!

Once the glass is removed, the cuts are metal patched with the liquid equivalent of welding. I plan to leave these unfinished until I finalize what the hell this project is even getting me, lol.

Primed after metal patching.

Final coat of low gloss black, no clear coat until I know for sure I plan to keep this setup.

Here's what the upper side will look like, roughly. Unfinished for now.

DERJ · 10-03-2010, 05:08 PM

franco209 · 10-03-2010, 05:28 PM

Any pic for the inside?

r4gs · 10-03-2010, 06:52 PM

interesting project. ^+1 on seeing the insides of the stock muffler!

Thisisdudewhoru · 10-03-2010, 07:13 PM

I'm getting ready to do cutouts right before the mufflers on mine.

johanness · 10-03-2010, 09:46 PM

Quote:

Originally Posted by Thisisdudewhoru

I'm getting ready to do cutouts right before the mufflers on mine.

^^^Awesome! Please keep us in the loop on your progress.

Curious to see what's inside our cans too.

Thisisdudewhoru · 10-03-2010, 09:54 PM

Anybody know the size of piping on stock mufflers? I was guessing 2.5 i.d. and was gonna go with a set of these right before both mufflers and turn them to where the exit is facing the wheels on each side. Gonna secure the caps with wingnuts so I can remove or recap them by hand and have easy access.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

Z4-VILLA · 10-03-2010, 11:37 PM

holy shit that looks really good....like really nice.

3002 tii · 10-04-2010, 08:38 AM

looks good but how does it sound???

ScottinSSMD · 10-04-2010, 09:25 AM

Didn't take any shots of the innards. Thought that was a given, maybe not.

Hopefully remounting tonight, and may get a sound check. We'll see. Weather sucks today through Wednesday.

Quickid · 10-04-2010, 09:48 AM

Interesting project.... subscribing now!!!

krnnerdboy · 10-04-2010, 10:13 AM

hmmm....are there any baffles inside or is it perforated tubing w/ filler on the sides? I would probably get that welded shut after you decide to keep it, as the JB weld may accumulate leaks down the line.

Food for thought, my dirtbike has a muffler that requires packing every so often. And it's dyno proven hp when packed over being empty....but then again,

we're just in it for the sound

shragon · 10-05-2010, 01:20 PM

wow, that's a lot of packing!

too bad you didn't get any pics of the internals.

looking forward to hearing how it sounds.

misterawa · 10-05-2010, 01:25 PM

Quote:

Originally Posted by shragon

wow, that's a lot of packing!

too bad you didn't get any pics of the internals.

looking forward to hearing how it sounds.

Me too! Please post some update pics and a video once the project is competed.

Crimson92 · 10-05-2010, 05:08 PM

hmm this with headers..??

wonder what that sounds like.

ScottinSSMD · 10-05-2010, 05:48 PM

That was a complete waste. Sound is stock, the same as with the glass packed in.

Well, at least I know it's a three chambered system to mess with. Will sleep on it and figure a boring option between pipes and chambers. Dumps are just too loud for me, and stock just won't cut it.

krnnerdboy · 10-05-2010, 06:21 PM

Quote:

Originally Posted by ScottinSSMD

That was a complete waste. Sound is stock, the same as with the glass packed in.

Well, at least I know it's a three chambered system to mess with. Will sleep on it and figure a boring option between pipes and chambers. Dumps are just too loud for me, and stock just won't cut it.

that was a great effort though

...on the muffler delete did you just remove the oem mufflers? or did you actually have a pipe/tip made? I assure you that the noise is completely different from just removing your mufflers and driving around.

If your dead set on getting a custom setup, I'd recommend starting w/ the delete and then add a muffler from there on.

ZStig · 10-05-2010, 11:58 PM

Quote:

Originally Posted by Trev

+1 very interested to see what the stocker looks like on the inside.

I've been toying with the idea of running a straight tube internally from the inlet to one of the two tips. By swiss cheesing this tube & using an external bypass valve you'd end up with a dual mode muffler.

Similar to this flowtech design http://www.holley.com/types/Warlock.asp

wonder if anyone here's tried those

nlink720 · 10-13-2010, 09:25 PM

How much did each muffler weigh... do you know?

I'm considering a muffler delete for weight, but want to avoid droning and excessively high noise levels. Probably delete my muffler, run it all the way out, and then go from there with perhaps a Supersprint if it drones too much or is too loud.

Great posting by the way. You should come to Fedex Field and join us at WDCR SCCA.

10-03-2010, 09:10 AM	#1
ScottinSSMD Looking for a track car 4 Rep 242 Posts Drives: 2006 325xi wagon Join Date: Sep 2008 Location: Silver Spring, MD iTrader: (2) Garage List 2006 325xi [0.00]	Stock muffler mod out there? Since I was bored yesterday and running without mufflers, I decided to open up a muffler to see what I can or can't do with it. Will most likely pull out the glass and reseal to start with. See where that goes. Also plan to paint the bottom and tips semi-gloss black. I was amazed at how much glass is packed in all the chambers. Once I put these back together, I will remount to see if this was just a waste of time. __________________
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10-03-2010, 03:08 PM	#2
ga41 Lieutenant 31 Rep 503 Posts Drives: Z4 M Coupe Join Date: Jun 2009 Location: Paphos iTrader: (0) Garage List 2006 Z4 M Coupe [0.00]	Sounds like an interesting project. Maybe post some pictures if you have any? __________________
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10-03-2010, 03:20 PM	#3
Trev Private First Class 5 Rep 108 Posts Drives: Z4MC Join Date: May 2010 Location: Portland Oregon iTrader: (0)	+1 very interested to see what the stocker looks like on the inside. I've been toying with the idea of running a straight tube internally from the inlet to one of the two tips. By swiss cheesing this tube & using an external bypass valve you'd end up with a dual mode muffler. Similar to this flowtech design http://www.holley.com/types/Warlock.asp
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10-03-2010, 03:42 PM	#4
ScottinSSMD Looking for a track car 4 Rep 242 Posts Drives: 2006 325xi wagon Join Date: Sep 2008 Location: Silver Spring, MD iTrader: (2) Garage List 2006 325xi [0.00]	Well, I was contemplating a straight pipe but since I have been running muffler-less for the past couple of weeks I decided to do this project. Straight pipe/no pipe is too ricey and loud. Not sure what to expect from this mod but will see tomorrow when I get a chance to remount. Very easy, really just needed the time during the past 2 days to do this. I first picked the top side due to the welds that would hold the panels in place after I did my cutting. Also, because I did not want any evidence that this had even been done when it is lifted, checked, eyeballed from below. Picked my lines and cut with a grinder. ABout 20 minutes for each one, tops. Look how much friggin glass is packed into just one of these!!!!!! Once the glass is removed, the cuts are metal patched with the liquid equivalent of welding. I plan to leave these unfinished until I finalize what the hell this project is even getting me, lol. Primed after metal patching. Final coat of low gloss black, no clear coat until I know for sure I plan to keep this setup. Here's what the upper side will look like, roughly. Unfinished for now. __________________
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10-03-2010, 05:08 PM	#5
DERJ Enlisted Member 1 Rep 37 Posts Drives: 2007 Z4 M Coupe Join Date: Nov 2008 Location: Texas iTrader: (1)	__________________ - DERJ
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10-03-2010, 05:28 PM	#6
franco209 Private First Class 12 Rep 167 Posts Drives: 2010 M3 Coupe Join Date: Jun 2010 Location: Charlotte, NC iTrader: (7)	Any pic for the inside?
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10-03-2010, 06:52 PM	#7
r4gs Viper Driver 36 Rep 1,311 Posts Drives: F-16 Join Date: Aug 2010 Location: Singapore iTrader: (2)	interesting project. ^+1 on seeing the insides of the stock muffler!
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10-03-2010, 07:13 PM	#8
Thisisdudewhoru Captain 82 Rep 698 Posts Drives: 16 BSM 340i Join Date: Mar 2010 Location: 423 iTrader: (1)	I'm getting ready to do cutouts right before the mufflers on mine. __________________ '16 BSM 340i M Sport + Track Pack.:.M Perf Exhaust.:.Polished BBS RS-GT.:.JB4.:.BMS Intake.:.H&R Sport.:.
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10-03-2010, 09:54 PM	#10
Thisisdudewhoru Captain 82 Rep 698 Posts Drives: 16 BSM 340i Join Date: Mar 2010 Location: 423 iTrader: (1)	Anybody know the size of piping on stock mufflers? I was guessing 2.5 i.d. and was gonna go with a set of these right before both mufflers and turn them to where the exit is facing the wheels on each side. Gonna secure the caps with wingnuts so I can remove or recap them by hand and have easy access. http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT __________________ '16 BSM 340i M Sport + Track Pack.:.M Perf Exhaust.:.Polished BBS RS-GT.:.JB4.:.BMS Intake.:.H&R Sport.:.
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10-03-2010, 11:37 PM	#11
Z4-VILLA Banned 111 Rep 2,460 Posts Drives: Z4M Hardtop Roadster Join Date: Feb 2009 Location: Classified iTrader: (0)	holy shit that looks really good....like really nice.
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10-04-2010, 08:38 AM	#12
3002 tii Lieutenant General 2282 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.22]	looks good but how does it sound??? __________________ Follow for latest mods
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10-04-2010, 09:25 AM	#13
ScottinSSMD Looking for a track car 4 Rep 242 Posts Drives: 2006 325xi wagon Join Date: Sep 2008 Location: Silver Spring, MD iTrader: (2) Garage List 2006 325xi [0.00]	Didn't take any shots of the innards. Thought that was a given, maybe not. Hopefully remounting tonight, and may get a sound check. We'll see. Weather sucks today through Wednesday. __________________
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10-04-2010, 09:48 AM	#14
Quickid First Lieutenant 11 Rep 331 Posts Drives: 08 Z4MC, 06 X5 4.4i, 99 323i Join Date: May 2010 Location: Ontario, Canada iTrader: (4)	Interesting project.... subscribing now!!!
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10-04-2010, 10:13 AM	#15
krnnerdboy Colonel 190 Rep 2,431 Posts Drives: v10 m6 Join Date: Nov 2008 Location: so cal iTrader: (10)	hmmm....are there any baffles inside or is it perforated tubing w/ filler on the sides? I would probably get that welded shut after you decide to keep it, as the JB weld may accumulate leaks down the line. Food for thought, my dirtbike has a muffler that requires packing every so often. And it's dyno proven hp when packed over being empty....but then again, we're just in it for the sound __________________ F80 m3, 997 gt3, 14 ram ctd, f15 x5, drz400sm Gone:z4m, boss 302, c6 z06, m6,z3m
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10-05-2010, 01:20 PM	#16
shragon Moderator 497 Rep 27,441 Posts Drives: BMW Join Date: Oct 2005 Location: Bay Area, CA iTrader: (7)	wow, that's a lot of packing! too bad you didn't get any pics of the internals. looking forward to hearing how it sounds. __________________ www.cardomain.com/id/shragon
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10-05-2010, 05:48 PM	#19
ScottinSSMD Looking for a track car 4 Rep 242 Posts Drives: 2006 325xi wagon Join Date: Sep 2008 Location: Silver Spring, MD iTrader: (2) Garage List 2006 325xi [0.00]	That was a complete waste. Sound is stock, the same as with the glass packed in. Well, at least I know it's a three chambered system to mess with. Will sleep on it and figure a boring option between pipes and chambers. Dumps are just too loud for me, and stock just won't cut it. __________________
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10-13-2010, 09:25 PM	#22
nlink720 Second Lieutenant 20 Rep 231 Posts Drives: 2004 BMW Z4 Roadster Join Date: Jan 2008 Location: Maryland iTrader: (3)	How much did each muffler weigh... do you know? I'm considering a muffler delete for weight, but want to avoid droning and excessively high noise levels. Probably delete my muffler, run it all the way out, and then go from there with perhaps a Supersprint if it drones too much or is too loud. Great posting by the way. You should come to Fedex Field and join us at WDCR SCCA. __________________ FS: Leather Recaro Pole Position Seats & Hardware
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