e92 335 performance exhaust got quieter?

MiKc · 07-05-2015, 02:05 PM

Hey guys,

So I've installed the performance exhaust for n54 a few months ago and I've started to notice that the sound got quieter
Could it be water accumulated inside the muffler that's causing it to sound quieter?
I bought the exhaust used from a local member and during install, the muffler shop had to dump out A LOT of water

. They even suggested to drill a water drain hole...Is that normal? Has anyone drilled a hole on their performance exhaust?
Any other way to get the water out?
The accumulation of water is leading me to believe that it might be the cause to making the exhaust quieter overtime?

Anyone experiencing the same?
Any input would greatly be appreciated....I really want the loud growl back

Thanks!

Chris@BoostConcepts · 07-05-2015, 02:48 PM

Most mufflers utilize a small drain for this purpose. Condensation builds up over time if you only use the car for short runs. If you take longer drives with it the heat and exhaust flow will burn it off after a few miles.

I agree with the drain holes though. Will keep it from sitting in the mufflers for long periods of time when not driven.

BMDoublYou · 07-05-2015, 02:48 PM

I had the same thing when I installed my used PE, plenty of water to dump, Leads me to believe it is normal because stock exhaust had an equal amount of water in it! You are just getting more used to it, It may just be a placebo effect!

MiKc · 07-05-2015, 02:54 PM

Quote:

Originally Posted by lcvette

Most mufflers utilize a small drain for this purpose. Condensation builds up over time if you only use the car for short runs. If you take longer drives with it the heat and exhaust flow will burn it off after a few miles.

I agree with the drain holes though. Will keep it from sitting in the mufflers for long periods of time when not driven.

I tried searching to see if anyone used a drain hole on PE but cannot find anything...
Would probably be best if someone has done it, giving me a heads up on where to drill
I guess I gotta go for a long drive? to hopefully burn off the condensation?

Quote:

Originally Posted by BMDoublYou

I had the same thing when I installed my used PE, plenty of water to dump, Leads me to believe it is normal because stock exhaust had an equal amount of water in it! You are just getting more used to it, It may just be a placebo effect!

Ya haha I hope it is just the placebo effect
But I swear cold start was MUCH louder when I first installed it

Chris@BoostConcepts · 07-05-2015, 03:16 PM

Drill the hole in the low point of the muffler. Small hole. Like 1/8"... This is where the water will end up even if it accumulates in the pipes. It will run back to the muffler under hard acceleration from g force and exhaust flow. From here it will drain when conditions return to normal. It will also be where much of the water accumulates after shut down since this is a very large surface area with a large temperature differential on each side. It will drip as it cools so be warned if you have a nice garage floor. Expect black sooty water marks from the draining.

MiKc · 07-05-2015, 05:10 PM

has anyone drilled drain hole on their performance exhaust?
dont want to be the first...possibly destroying the tone!

kong24680 · 07-05-2015, 05:27 PM

I personally wouldn't do it

Chris@BoostConcepts · 07-05-2015, 05:40 PM

An 1/8" hole on the outside has all the packing material between it and the perforated tube, it is very far back in the system and is a tiny hole. You will not hear it at all, most factory systems have these "weep" holes to keep them from rotting from the i side out. If it's stainless. It will be fine with the water in it but the packing staying wet will eventually begin to cake with soot and this will quiet down the exhaust as it becomes a heavier medium with build up and offer more baffling. That is about the only result if it's 100% stainless steel inside and out.

LQQKOUT · 07-05-2015, 05:57 PM

I have done it to mine a few years ago. No bad side effects.

MiKc · 07-05-2015, 06:17 PM

Quote:

Originally Posted by LQQKOUT

I have done it to mine a few years ago. No bad side effects.

did you find the muffler getting quieter at first?
then louder after draining the water?

any picture where you drilled the hole?

Chris@BoostConcepts · 07-05-2015, 08:25 PM

Just Google muffler weep hole and click in images... Will be clear as mud, lowest point of the muffler, 1/8th drill bit.

ferocity02 · 07-05-2015, 11:23 PM

When I installed my PE I dumped about a gallon of water out of the stock mufflers. I also want to drill a hole in my PE mufflers to prevent this. I doubt it will have any effect on the sound. If it does you could always thread in a screw to cap off, or seal it with some RTV.

I have not noticed it getting quieter, but I don't like the idea of the mufflers being filled with gallons of water.

07-05-2015, 02:05 PM	#1
MiKc Lieutenant Colonel 108 Rep 1,662 Posts Drives: BSM E92 335i Join Date: Jun 2011 Location: Vancouver, BC iTrader: (5)	e92 335 performance exhaust got quieter? Hey guys, So I've installed the performance exhaust for n54 a few months ago and I've started to notice that the sound got quieter Could it be water accumulated inside the muffler that's causing it to sound quieter? I bought the exhaust used from a local member and during install, the muffler shop had to dump out A LOT of water . They even suggested to drill a water drain hole...Is that normal? Has anyone drilled a hole on their performance exhaust? Any other way to get the water out? The accumulation of water is leading me to believe that it might be the cause to making the exhaust quieter overtime? Anyone experiencing the same? Any input would greatly be appreciated....I really want the loud growl back Thanks! Last edited by MiKc; 07-05-2015 at 03:06 PM..
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07-05-2015, 02:48 PM	#2
Chris@BoostConcepts 172 Rep 312 Posts Drives: 2008 BMW 135i, 2007 335i e92 Join Date: Jun 2013 Location: Wilmington, NC iTrader: (2)	Most mufflers utilize a small drain for this purpose. Condensation builds up over time if you only use the car for short runs. If you take longer drives with it the heat and exhaust flow will burn it off after a few miles. I agree with the drain holes though. Will keep it from sitting in the mufflers for long periods of time when not driven.
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07-05-2015, 02:48 PM	#3
BMDoublYou Captain 117 Rep 622 Posts Drives: 09 E90 335xi / 08 E82 128i Join Date: Nov 2012 Location: True North iTrader: (1)	I had the same thing when I installed my used PE, plenty of water to dump, Leads me to believe it is normal because stock exhaust had an equal amount of water in it! You are just getting more used to it, It may just be a placebo effect!
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07-05-2015, 03:16 PM	#5
Chris@BoostConcepts 172 Rep 312 Posts Drives: 2008 BMW 135i, 2007 335i e92 Join Date: Jun 2013 Location: Wilmington, NC iTrader: (2)	Drill the hole in the low point of the muffler. Small hole. Like 1/8"... This is where the water will end up even if it accumulates in the pipes. It will run back to the muffler under hard acceleration from g force and exhaust flow. From here it will drain when conditions return to normal. It will also be where much of the water accumulates after shut down since this is a very large surface area with a large temperature differential on each side. It will drip as it cools so be warned if you have a nice garage floor. Expect black sooty water marks from the draining.
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07-05-2015, 05:10 PM	#6
MiKc Lieutenant Colonel 108 Rep 1,662 Posts Drives: BSM E92 335i Join Date: Jun 2011 Location: Vancouver, BC iTrader: (5)	has anyone drilled drain hole on their performance exhaust? dont want to be the first...possibly destroying the tone!
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07-05-2015, 05:27 PM	#7
kong24680 Captain 252 Rep 998 Posts Drives: Silverstone Metallic F06 M6 Gr Join Date: Feb 2014 Location: Bay Area iTrader: (5)	I personally wouldn't do it
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07-05-2015, 05:40 PM	#8
Chris@BoostConcepts 172 Rep 312 Posts Drives: 2008 BMW 135i, 2007 335i e92 Join Date: Jun 2013 Location: Wilmington, NC iTrader: (2)	An 1/8" hole on the outside has all the packing material between it and the perforated tube, it is very far back in the system and is a tiny hole. You will not hear it at all, most factory systems have these "weep" holes to keep them from rotting from the i side out. If it's stainless. It will be fine with the water in it but the packing staying wet will eventually begin to cake with soot and this will quiet down the exhaust as it becomes a heavier medium with build up and offer more baffling. That is about the only result if it's 100% stainless steel inside and out.
	Appreciate 0 Quote

07-05-2015, 05:57 PM	#9
LQQKOUT Lieutenant 104 Rep 416 Posts Drives: 335XI Join Date: Jul 2011 Location: United States iTrader: (4)	I have done it to mine a few years ago. No bad side effects.
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07-05-2015, 08:25 PM	#11
Chris@BoostConcepts 172 Rep 312 Posts Drives: 2008 BMW 135i, 2007 335i e92 Join Date: Jun 2013 Location: Wilmington, NC iTrader: (2)	Just Google muffler weep hole and click in images... Will be clear as mud, lowest point of the muffler, 1/8th drill bit.
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07-05-2015, 11:23 PM	#12
ferocity02 Colonel 553 Rep 2,085 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	When I installed my PE I dumped about a gallon of water out of the stock mufflers. I also want to drill a hole in my PE mufflers to prevent this. I doubt it will have any effect on the sound. If it does you could always thread in a screw to cap off, or seal it with some RTV. I have not noticed it getting quieter, but I don't like the idea of the mufflers being filled with gallons of water.
	Appreciate 0 Quote